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EGR Cleaning and EGR Cleaners

by Andy Published on Monday, July 29th, 2013

An EGR valve, or exhaust gas recirculation system is a primary component of an engine’s emissions system on petrol and diesel powered vehicles. Its purpose is to reduce NOx emissions by recycling a proportion of the combustion gases that normally exit through the exhaust. A valve is used to control the flow of gases, which are re-routed through the intake system, where they are re-combusted with fresh intake air and fuel. On a correctly functioning EGR system, this lowers undesirable exhaust emissions.

The problem with these systems, particularly diesel vehicles, is that excess hydrocarbons are produced during the combustion process. These hydrocarbons deposit themselves on the EGR valve and periphery pipework, where the EGR routes back into the intake system. Over time, this clogs and eventually blocks the EGR valve and the associated pipework.

Additional Source of Deposit Build-up!

It is important to note that the carbon buildup in an EGR system and other emission control components is not only from the combustion process. In most cases, it’s a combination of combustion-produced hydrocarbons and deposits from the crankcase oil. This is where many fail to correctly arrest deposit build-up on the EGR after it has been cleaned or replaced. More on this later…

The engine oil can bypass the piston rings, valve stem seals, and crankcase breather system (PCV). That oil is then consumed during the combustion process, but it isn’t fully combusted. The unburned oil and fuel are both recycled and deposited within the EGR. The oil will polymerize onto the metal surfaces due to the strong affinity between oil and metal. This newly formed surface acts as a “sponge” for all other particulates in the recirculating exhaust gases.

You have a combination of bypassed oil and unburned fuel deposited within the EGR system. This turns into a solid, which builds up and clogs the EGR valve and associated pipework, causing faulty operation.

If the EGR valve begins to stick or is blocked up, the solenoid used to operate it will draw more current to open it. The ECU detects that condition and throws an engine warning light.

The symptoms of a faulty EGR include:

Hesitation
Stumbling
Excessive emissions/smoke during acceleration
Engine warning lights

As deposits begin accumulating, this restricts the flow of gases and disturbs the fuel mixture. The ECU expects a certain amount of recirculating gases as the EGR valve transitions from closed to open and visa-versa. These gases are not delivered as anticipated, hence the air/fuel ratio disturbance. This can result in hesitation, stumbling, and excess emissions, particularly during acceleration.
Natural Carbon Removal

Now, there is a natural carbon cleaning mechanism, and most additive manufacturers won’t tell you this. Suppose you’re able to improve the quality of combustion and are thus able to produce cleaner exhaust gases during the combustion process. In that case, these cleaner exhaust gases will naturally scavenge and remove carbon. This is also the case with many emission control components attached to the exhaust system, such as the hot side of the turbocharger, catalytic converter, or a diesel particulate filter.

You can naturally clean these areas. Many additives you see on the market today are essentially just fuel system cleaners and combustion catalysts. They might be promoted and marketed as EGR cleaners, DPF cleaners, and so on, but they’re nothing more than fuel system cleaners. What they do is restore the efficiency of the fuel system and, by doing so, improve the efficiency of the combustion, which reduces hydrocarbon production. In addition, some products contain a fuel catalyst technology that in itself will lower the hydrocarbons produced. You’re left with cleaner exhaust gases, which will help naturally remove the carbon from these mentioned areas. Except for a few products that contain technologies where molecules are activated during combustion (more on this later), such cleaners do not directly clean these areas, as the chemistry is destroyed during the combustion process.

The Problem with Natural Removal and EGR Valves

This natural cleaning mechanism is not always effective when cleaning the EGR system. The reason for this is that when cleaning carbon from your engine, heat is the primary factor. There must be sufficient heat. Heat, combined with the cleaner, recycled exhaust gases, helps remove carbon. The problem with the EGR is that the gases are usually cooled when they reach the valve and the periphery pipework. Therefore, the natural cleaning mechanism is not always as effective with EGRs, so you have to take alternative action.

Alternative Cleaning for EGR Valves and Systems

Unfortunately, the most effective way to clean an EGR is to remove and clean it manually (if you have access to it). You’ll remove the EGR and the periphery pipework. Scrape off as much carbon as you can manually, then use a quality EGR aerosol cleaner to clean the remainder and reassemble the system.

If you don’t have easy access to the EGR valve, you can use an in situ aerosol-based EGR cleaner that you can either spray into the EGR pipework or through the air intake and clean the EGR this way. However, particularly with diesel engines, you must be very careful. You don’t want to damage the engine. If you’re in doubt, you should let a trained professional carry out this procedure for you.

Once the EGR is clean and operational, it is essential to take the steps necessary to prevent further carbon buildup. While you can never stop it completely, you can maintain a manageable level of carbon that the engine can naturally consume without the deposits becoming excessive. If you were to remove the EGR, you’d be looking for a fine layer of carbon that you can scratch off with your nail. Anything more than that would be considered excessive.

Maintain and Protect

1. Firstly, use a high-quality polyetheramine-based fuel system cleaner and carbon remover to ensure injector and combustion efficiency is restored. Otherwise, you’ll end up with a clogged EGR valve soon after. We recommend Oilsyn Diesel Dr/Petrol Dr or Archoil AR6400-P/AR6400-D MAX.

2. Secondly, you need high-quality engine oil and/or oil additive that helps prevent oil from bypassing the crankcase breather system or piston rings and polymerizing with the EGR system. You must tackle the problem from both the fuel system end and also the crankcase oil. I recommend a high-quality oil additive pack such as Archoil AR9200 or AR9400. These have been shown to prevent polymerization and even remove carbon from these areas in some cases.

3. Thirdly, and particularly if most of your driving is short or start/stop, use a high-quality ongoing fuel additive containing an effective combustion modifier or fuel catalyst. We recommend Oilsyn Diesel Race DNA, Petrol Power DNA, or Archoil AR6900-D MAX / AR6900-P MAX. These will improve the combustion quality and lower the amount of hydrocarbons being produced and thus recycled through the system, especially when the engine is in its warm-up cycle. Most of the time, you’ll only use a little bit of the product at a time, and a single bottle will last for multiple tanks of fuel.

Get Out and Drive

Finally, it’s important to make you aware our view is that most of today’s vehicles are commonly mis-sold. They are simply not designed for the short journeys that many people use them for – around town driving, shopping runs, school runs, etc. If the vehicle is not permitted to get up to temperature frequently, hydrocarbons will inevitably be produced and deposited throughout the system.

Because of the lack of heat, it will be challenging for the engine and the emissions control components to naturally manage carbon within the system. Therefore, using the correct oil, fuel, and fuel additives is essential to keeping the engine running efficiently.

If you require any advice or help, please don’t hesitate to contact us, and a member of my team or I will be pleased to help.

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92 thoughts on “EGR Cleaning and EGR Cleaners”

Ian Domala says:
August 18, 2022 at 12:04 pm
I have a discovery sport 2017 and the EML came on, found out the code, looked it up and it said insufficient gas flow, so a LRJ mechanic told me to buy the EGR cooler filter and get it replaced, (LRJ £1100) (independent £15 filter, £200 fitted and light reset) obviously went the cheaper route, been not even 6 months and the blooming EML is on again, same thing?, been told now filter would be clogged again but being only 6 months old, to shoot some EGR cleaner into the air intake, let it do it’s job and this should clear it again, or should I have it replaced again, but this time with a full clean of all soot deposits as I suspect this wants done with just the filter change? I used to mechanically fix my own cars so removing and cleaning it myself would be a doodle but I have not idea where to access the EGR cooler from within the engine bay or underneath and cannot find a diagram anywhere showing if it’s accessible from the roadside? HELP! Ian
Reply
1. Andy says:
  August 18, 2022 at 8:23 pm
  If it is blocked after 6 months then there is another underlying problem or a blockage elsewhere in the system that was missed. Using an EGR cleaner is a low-cost process of elimination but it can’t be rushed and requires patience. If that fails then pull it apart and clean manually. I would check LR forums for advise on accessing the cooler and periphery pipes. hoses etc.
  Reply
  1. Ian Domala says:
    August 20, 2022 at 11:36 am
    Thanks Andy
    Reply
Rob says:
August 15, 2022 at 2:08 pm
I couldn’t agree more on the mis-sold side of things, somewhat historic since the encouragement of Govt. to buy diesels for domestic use. For big van users, we are caught in a bind; we need a big van for the business but if we do a large percent of local work, it struggles to get to full temp. But there are hardly any big petrol vans, so we’re stuck with diesels, clogging EGR’s & DPF’s & the cost of more constant, intensive maintenance than if we tramp up & down motorways every day with hotter running engines.
Having just had a possible EGR related fault code following a breakdown I’m having to reassess. Most likely have to remove EGR to clean. What with? Obv’ next stage would be a
replacement £££!
Reply
Saj says:
August 2, 2022 at 9:31 pm
Hi, many thanks for your extremely useful and helpful post. My EML is on and the diagnostics reveal the DPF is constantly regenerating because of the EGR cooler and have been told this will need replacement. My car is an Audi A5 2017, I do a motorway journey once a month at least so it’s not just short journeys.
I could really use your expertise in whether you know anyone in or around the Yorkshire area who can help with this and if whether you have heard of the above scenario before. Any advice guidance who be welcomed
Reply
1. Andy says:
  August 3, 2022 at 2:43 pm
  Not that close to you but Gee Diesel Services.
  Reply
Mary Banks says:
February 4, 2022 at 10:12 pm
Hi,I have a VW Caddy 2016.
Driving South Coast to Midlands the EML started flashing. Managed the rest of the journey slow but steady.
Checked fault code – P0403 EGR flow circuit malfunction. Had the EGR valve replaced 1 year ago.
Switched engine on again after a while – EML light no longer appears, but obviously may well kick in again after driving for a bit (don’t know yet, haven’t tested).
I need to get back to the south coast from the Midlands and ideally would like to get it fixed down there back near home. What are the chances of me doing this? Any short term solutions to help my van make it?
Grateful for any advice, thank you
Reply
1. Andy says:
  May 19, 2022 at 10:01 am
  Only if a competent Mechanic as it is not an easy job on that engine.
  Reply
Libero Colimberti says:
January 11, 2022 at 10:02 pm
Thank you. Is the part in question 100% mechanic or does it have any electric elements? Just want to get a better idea if anything more than a dirty valve may stop working correctly, to cause this situation
Reply
Libero Colimberti says:
January 6, 2022 at 9:21 pm
Hello,
VW T6 2.8 2016 blueline. EGR valve needs attention. Mechanic wants to replace, but how do I know it is necessary? He didnt even suggest that he could clean it once taken out. Can I just use an additive? No symptoms except a warning light
Reply
1. Andy says:
  January 10, 2022 at 9:14 am
  They only need to be replaced if faulty. However, some mechanics will replace with new to avoid any comebacks.
  Reply
  1. Andy says:
    May 19, 2022 at 9:59 am
    There will be some electrical element such as a solenoid/vacuum control or similar.
    Reply
2. Peter Wolstenholme says:
  August 13, 2022 at 6:14 am
  The symptom is the warning light. In my view it would be far better to get a remap which disables the EGR valve completely and just leaves it in the closed position. The engine management file needs to be rewritten to compensate but if this is done along with cleaning the throttle body where the EGR valve fed the dirty air into it, the xar will perform much better and give much less problems altogether. It doesn’t even affect the MOT emissions if done properly
  Reply
  1. Andy says:
    August 15, 2022 at 2:22 pm
    Not only now is it a criminal offence to do this but the net effect is higher emissions output.
    Reply
Kirsty says:
December 16, 2021 at 9:38 pm
Hi my EML has just illuminated on seat Leon fr mk3 and when we plugged in the code reader it says fault p0401 EGR flow insufficient can this be resolved by taking apart and cleaning? There seems to be no other signs but the light itself so far.
Reply
1. Andy says:
  January 10, 2022 at 9:12 am
  Yes, if easily accessible, remove and clean as well as pipework leading from the EGR to the intake plenum.
  Reply
John Denton says:
November 9, 2021 at 7:12 pm
Hi have an engine warning light on my Ford Focus 1.6 Econotec Diesel car (2013 plate).I ve been told by the local garage that it will cost about £650 to replace it. Is there any way I can reduce the cost by cleaning it and, if so, can anyone recommend someone near to Treorchy in the Rhondda (25 miles from Cardiff) who can do it. I also need a full service with a replacement timing belt if that is best done at the same time. Thanks
Reply
1. Andy says:
  November 17, 2021 at 11:00 am
  What are the garage suggesting needs replacing?
  Reply
pat young says:
September 10, 2021 at 12:15 pm
HI Andy i have recently bought a bmw 318 es petrol, diagnosed egr problem and on limp mode,aparrantly the gear box has to be removed to get to the EGR which i have checked its right at back of the engine above the CAT even taking CAT off i dont think its possible to remove the EGR , so before i contemplat removing the Gear box have you any ideas i can try, THANKS in advance Pat young
Reply
1. Andy says:
  November 17, 2021 at 11:18 am
  Any aerosol based EGR may help but it really must be administered by a professional.
  Reply
Richard says:
August 30, 2021 at 5:26 pm
Hi, I hope you can help. Long story short, our 2003 Volvo XC90 2.9 T6 kept stalling at slow speeds, replaced the PCV box and now it runs great, but, is smoking badly.
It passed a head gasket test and a shop told me it might be the turbo.
Another shop told me it might be to do with the EGR system.
I can only find anything to do with the EGR on the diesel version of my car, so please could help me with where would I find anything serviceable to do with EGR that I could cry over?
We’ve tried everything we can think of before scrapping the car which we DON NOT want to do. She’s very much beloved, but around £2500 to have the turbos replaced is just to much at the moment.
Thanks
Reply
1. Andy says:
  November 17, 2021 at 11:21 am
  What colour is the smoke and under what driving conditions (be precise here) do you see the smoke?
  Reply
Victoria (Vics) Dupuis says:
August 17, 2021 at 3:29 pm
After EML coming on a few times I took my 2011 Audi A3 2.0 diesel to the garage and they advised EGR valve. They will only replace with genuine manufacturer parts (quoted at c£900!!!) so hoping to get EGR cleaned.
Can you advise on how I can find a reputable garage to do this please (based in East Devon)? Is there some sort of qualification I need to look for? And what sort of price should I expect to be paying?
Thanks, Vics
Reply
1. Andy says:
  August 18, 2021 at 9:43 am
  The EGR and associated hoses/parts will need to be removed and cleaned. Any independent diesel specialist should be able to do this for you.
  Reply
Daniel says:
August 6, 2021 at 8:28 am
Hi, I have the 2.0hdi 160bhp engine in the Citroen DS4 2012, on 60k, egr cooler is playing up and I think it might need replacing, engine light is ON, slight slow loss of coolant and engine oil without any signs of leaks as well as plenty of carbon deposit soot build up inside the silver pipe which connects to the egr, as well as oily residue in the throttle body and the big air pipe which connects to it. Do you think it’s worth trying to clean or once there is signs of coolant loss it’s too late as the inside of the egr cooler has perhaps raptured in some way. Please tell me what you think from that info or ask anything else you need to know. I really appreciate any help you can give, thank you, Dan.
Reply
1. Andy says:
  August 18, 2021 at 9:45 am
  It depends on the amount of coolant loss? How much are you having to top up and how frequently?
  Reply
Robert Faulkner says:
April 18, 2021 at 6:17 pm
This AR6400-D sounds like a merical.
Ive just got Reduced Engine Performance message on my Volvo c30 1.6d 2009. I only use it for very short journeys around town, and especially in lockdown, drive distance has been impossible. My car sometimes hesitates when first accelerating and looking into the issue Im suspecting possible EGR clogging. I am going on a long drive tomorrow, motorways to try and clear any blockages, as apparently continuous driving at 60-70mph is supposed to activate DPF regen. Im just wondering, would it be worth putting some AR6400D in the car anyway, even if it turns out that my problem isnt EGR related, or could that cause more problems?
Also Ive just filled the tank, so dont know if you neer to add this stuff first before filling, to get a good mix?
Thanks
Reply
1. Andy says:
  April 23, 2021 at 9:28 am
  AR6400-D can indirectly help the EGR by cleaning the fuel system and making the engine more efficient. As a result recirculating carbonaceous deposits are reduced and thus make it easier for the EGR to self regulate carbon deposits. If the EGR is blocked then a manual clean is best but cleaning the fuel system will still give the EGR an easier life regardless.
  Reply
Zaid says:
April 8, 2021 at 9:18 am
Hi, can I clean the EGR on my f10 530d 2010 by adding cleaner to the diesel tank?
cleaners like for ex:
JLM DIESEL EXTREME CLEAN
or
BARDAHL EGR valve cleaning kit?
Reply
1. Andy says:
  April 9, 2021 at 10:23 am
  Fuel based additives will only help a little. Aerosol based cleaners will work better. Removing the EGR and cleaning it manually along with the periphery pipework is the optimum solution.
  Reply
Steve says:
March 14, 2021 at 10:42 am
Hi
Have ‘13 Sprinter 316 (om651). Use shell V-power most of time but can be away in Europe/Morocco with varying quality fuels. Any recommendation to help with egr health?
Also Tiguan ‘15 2.0tdi (partners car) which gets filled with whatever fuel she stops at (Morrison’s etc, despite telling her to use V-power) best option for egr/fuel system health??…
Reading through you say not to use 6700D-max with performance fuels??…
Many thanks.
Reply
1. Andy says:
  March 30, 2021 at 9:47 am
  Use AR6900-D MAX with standard fuel and it will convert it into “Super” diesel.
  Reply
Jodie says:
March 6, 2021 at 2:55 pm
Hi, I have a 2016 volvo v40 D3. My EML came on last night and took it to garage today and the error code was P04d900. EGR valve problem.
I have been reading online and it appears its a very common fault with volvos! I (doubt it will work!) Am going to try and get the work done via volvo for free/reduced price. They are not open until Monday so I wanted to know if the car will be safe to drive or should I not drive until fixed?
Also (as I’m pretty sure I won’t get anywhere with volvo!) How much does this type of work usually cost around?
Reply
1. Andy says:
  March 8, 2021 at 9:38 am
  In the short term it is unlikely to be an issue getting to work but it will need resolving. The EGR function needs testing with a diagnostic tool to see if it is sticking. If so it will require a clean, or depending on the mileage, a replacement EGR.
  Reply
David Williams says:
March 1, 2021 at 8:59 am
Hi. I have a VW T6 Transporter 2017 with 39k on and having to top coolant fluid up every 600 miles. Do you think this is the EGR been carboned up. It seems the fluid loss is coming from the exhaust as it’s been pressure tested and seems okay for any leaks. My partner followed me and says I had a lot of fluid coming from the exhaust.
Reply
1. Andy says:
  March 1, 2021 at 9:44 am
  Likely the EGR or EGR cooler. Also check if it has any other separate coolers such as for the gearbox.
  Reply
Trevor Scott says:
February 25, 2021 at 4:18 pm
Hello
I have a 2014 jaguar xf auto sports. When I use the sports gear once slowing down the car very aggressively shuts down. No warning lights is displayed. A jaguar specialist did a diagnosis and stated that it could be the EGR but they wouldn’t confirm rigidly. What do you suggest please
Reply
1. Andy says:
  March 1, 2021 at 9:49 am
  What engine/fuel type?
  Reply
Gary R Dobbins says:
November 25, 2020 at 5:10 pm
Hi
Did you manage to resolve your issue?
I also have same car same year with 110,000 on the clock with EML on. I have tried various cleaners without luck.
May need to have major overhaul as I believe the lower o/s suspension needs to come off to gain access to DPF and EGR.
Reply
rockwell charles says:
September 12, 2020 at 10:15 am
Hi I have an Audi A6 TDi 2.0 ultra 2014 which has shown no change in drive quality, but the EML keeps coming on. After running some diagnostic tests it would appear that the EGR cooler may be clogged with soot.
I have acquired a secondhand replacement EGR cooler and was wonder as like the EGR valve it can cleaned and with what product or do I need to purchase a new one.
Reply
1. Andy says:
  September 14, 2020 at 4:34 pm
  If removed then use a low cost carb cleaner or send it off to be ultrasonically cleaned.
  Reply
Rab Lark says:
June 2, 2020 at 3:39 pm
Hi There, Some people blank the EGR valve off and delete the whole operation via the ECU , do you recommend this and what are the pros and cons
Thanks
Reply
1. Andy says:
  June 2, 2020 at 4:11 pm
  It is now a criminal offence to make alterations to any part of the emissions control system so it is not something we would recommend.
  Reply
sanjiv jankee says:
January 10, 2020 at 10:48 am
Hi i go my volvo xc60 2014,just got the engine management light come on. Done the diagnostic and its saying the EGR valve is block. Im a bit confuse what to do. Change the the EGR valve or call a company who does the mobile cleaning. Changing the valve cost a fortune and if i have to clean it what guaranty it wont clog again or block the DPF. Any advise would be much appreciated please. One last thing which i forgot how easy it is to remove the EGr and clean it manually?
Sanjiv
Reply
1. Andy says:
  February 10, 2020 at 3:27 pm
  Have the EGR valve removed and cleaned manually. Then use AR6900-D to help keep it clean.
  Reply
John says:
September 15, 2019 at 4:22 pm
Bought a high mileage diesel car( 2006 honda civic|) three years ago,but only do about 5000 miles a year.
Always use v-power diesel and regular oil changes.
Up to now have had no egr issues,is it best to start using archoil now,and what would you recommend(AR900)?
Reply
1. Andy says:
  September 17, 2019 at 8:50 am
  AR6900-D MAX with regular fuel. It will turn the fuel into a super diesel and more.
  Reply
Seth says:
July 6, 2019 at 12:22 pm
The latest thing is Catch cans to solve this problem but I am reluctant to put one on. I just had my manifold manually cleaned on my lc200 at 225000km and was considering using an egr cleaner spray instead at each service Interval. Would you consider this sufficient to keep the gunk at bay?
Reply
1. Andy says:
  July 10, 2019 at 9:28 am
  An EGR cleaner is fine but prevention is better. Use a quality fuel conditioner that is designed to improve combustion and thus lower the amount of carbon circulating around the system.
  Reply
umair iqbal says:
May 28, 2018 at 10:02 am
hi
have you ever heard of a throttle body cleaner causing any damage in the engine, because a carbon deposit has dislodged and ended up in the engine and has scratched up the cylinder wall or something
basically my f10 m5 is idling rough and i was thinking to run some cleaner through it, what do you think?
Reply
1. Andy says:
  June 26, 2018 at 11:37 am
  Very unlikely with deposits in the intake itself. The only potential risk is with hard, baked-on deposit from the inlet valves. Again, the risk is small.
  Reply
alan ashby says:
December 1, 2017 at 2:01 pm
The ‘engine management light’illuminated on my 2007 Mazda MX-5 without any obvious deterioration in performance. It was checked-over by a Mazda dealership who reported that the EGR valve was defective. I accessed this website as I had not previously heard of an EGR valve (I know now!), with the dealership quoting £227 plus VAT to fit a new one. It seems a worthwhile cost, to me, to replace the unit rather than scrape clean the old one.
Reply
1. Andy says:
  December 4, 2017 at 9:38 am
  Definitely attempt to clean the old one first.
  Reply
2. Steve Shaw says:
  March 5, 2018 at 8:27 pm
  If you can get the old egr valve out easily, then just get some carb cleaner and an old toothbrush (wear gloves!) and you will be astonished how clean you can get it, just takes your time to remove and refit.
  I wish I could easily get to the EGR/cooler on my VAG but sadly it’s a rotten 4hr job behind the engine, so I can’t give it a clean every year.
  Reply
Rod Green says:
August 21, 2017 at 3:29 pm
Having read all the reports on turbo / egr cleaner as to it being the answer to all the issues regarding cleaning of these components, I find from first hand experience (being a motor engineer) these claims seem a little extreme. Having used turbo cleaner with NO satisfactory results, but have had 100% results by doing the only successful method of removal of component, strip, clean, refit. or in extreme cases renew. Works every time. (DON’T CUT CORNERS) Do the job the correct way.
Reply
1. Andy says:
  August 22, 2017 at 9:39 am
  I agree there is no substitute for a manual strip down and clean. However, EGR cleaners offer some benefit providing air flow is not completely blocked. It can be sufficient to free up the valve on engines where the EGR and periphery pipework is labour intensive to access.
  The real issue here is education and many Technicians fail to address the root cause (oil quality, fuel quality and driving style) leaving the customer to face the same problem later on. Higher quality oil can be used as well as a catalyst based fuel conditioner to help neutralise the recirculating carbons.
  Reply
Tee says:
July 4, 2017 at 11:22 pm
Audi A5 3l diseal my engine lights keeps coming on. So I took it to the Garage and the diagnosis showed up that there was a fault with the coolant pump 2 open circuit and also showed code EGR System insufficient flow so I had these parts replaced and then the faults cleared. A few days later ( 1 week) as I was driving along the engine suddenly raved on high without me pressing hard on the throttle, a few minutes on as I carried on driving – the engine lights came back on again.
What do you think the faults might be?
Reply
1. Andy says:
  July 10, 2017 at 12:20 pm
  Apologies but unable to assist without inspecting the vehicle. I would take it back to whoever carried out the EGR replacement work.
  Reply
2. d says:
  September 9, 2017 at 7:47 pm
  turbo overboost.
  Reply
Gordon Roe says:
May 18, 2017 at 12:35 pm
The glow plug warning light is flashing on my 2012 Skoda Yeti 2.0 Tdi. 46K. My garage diagnosed that it needs a new EGR valve (£800). I have added the bottle of AR6400-D Max to a full tank of diesel. Will this cure the problem or will I still need to have the EGR valve replaced?
Reply
1. Andy says:
  May 18, 2017 at 1:21 pm
  Have the EGR inspected and cleaned. If it is difficult to access, hence high labour costs, then have the Technician try an aerosol based product.
  Reply
Tim says:
May 11, 2017 at 7:41 am
I have a 2014 520d BMW with 48k miles, 3x bmw services, driven on mix of roads and standard diesel – runs just fine. In you opinion would an aerosol based clearner be of benefit for this vehicle and if so is there anything I should be wary of in application, particularly with regards to MAF sensor – the various Ecotec youtube videos look straight forward, despite being in French.
Reply
1. Andy says:
  May 11, 2017 at 10:58 am
  They are useful as they also help clean the air intake and back of intake valves. However, an overly contaminated EGR is best removed and cleaned manually. CAUTION: Always spray at a point AFTER the MAF sensor. It requires patience: Short bursts ONLY allowing the engine to consume the product. Failure to do this can result in the engine running away and causing substantial damage.
  Reply
  1. Tim says:
    May 24, 2017 at 3:04 pm
    Thanks for the response. If I disconnect the MAF then this will trigger a fault in the ECU presumably. I could perhaps insert a pipe to allow a second airflow path which by passes the MAF, however again this might disrupt airflow sufficiently to trigger a fault being logged? It would also only partially allow the manual throttling of the airflow which is illustrated in the Ecotec youtube videos.
    Can you suggest an application method which would avoid logging a MAF fault?
    If one were to spray before the mAF then what are the implications of this and could once simply use MAF cleaner immediately afterwards without risk of damage?
    Reply
    1. Andy says:
      May 31, 2017 at 12:48 pm
      Most will keep the MAF connected but spray into the intake at a point after the MAF.
      Reply
Michal says:
April 10, 2017 at 12:30 am
Hi, I’ve got a problem with high oil consumption in my Mazda 2.0 petrol, I’ve been told that ar2300 can help to move stuck piston rings. The question is how long is safe to drive with additive in oil? Can it be couple thousands miles?
Reply
1. Andy says:
  April 12, 2017 at 9:38 am
  It is safe to use for the duration of the engine oil lifecycle.
  Reply
Barry Furniss says:
March 2, 2017 at 11:28 pm
Hi, Can I only use AR6900 in my Mondeo tdci 130 as a fuel additive,or is it ok to use AR6200?
Reply
1. Andy says:
  March 20, 2017 at 10:01 am
  You can use either but AR6900-D would be better for that engine.
  Reply
Steve Inch says:
February 7, 2017 at 10:35 pm
Hi Andy,
I have a Mitsubishi L200 pick up 09 plate and the engine is down on power,the engine management light is not on all the time but even when it’s not on the performance is still down. Is the EGR valve likely to be the cause and if so what would you recommend as a solution?
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1. Andy says:
  February 21, 2017 at 4:52 pm
  Difficult to say based on the information given. I would recommend having the error codes read first.
  Reply
charles whitmill says:
November 6, 2016 at 5:17 am
I recently bought a 2015 Kenworth T680 truck with 139,000 miles my current reading is 163,634 miles.Should I start using the product now as a part of my preventive maintenance program? Note I have a Cummins ISX15 under the hood
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1. Andy says:
  November 9, 2016 at 8:58 am
  Sure, regular use of AR6900-D MAX would be a good choice.
  Reply
eelis says:
September 23, 2016 at 10:44 pm
Hi
New to this forum. I have a 52 plate Mitsubishi Spacestar. Last year engine management light came on, took to garage and it was treated with “temporary fix”. Run smoothly for next 12 months and then problem again. Car lost her “mojo” resisting acceleration and when pressure put on engine engine management light would light up and release again when no demand on engine. Took to garage today, EGR totally had it and on revving the engine, masses of soot left on road. Booked in for repair in 2 days time. Is she still safe to drive? Been driving for 3 weeks with light on/off, have I damaged engine? Thoughts please.
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1. Andy says:
  September 25, 2016 at 11:03 am
  Without inspecting the vehicle I couldn’t confirm if it is safe to drive. However, an EGR fault is unlikely to cause any long term damage.
  Reply
keith thompson says:
July 12, 2016 at 7:12 pm
Hi guys i have recently changed my motor home for a fiat based Hymer 2.3 multijet engine.
After just a couple of weeks the engine management light came on so i had someone connect it to a diagnostics device and the code related to an egr problem.
would any of your products help cure this if so which one and where could i purchase it and also a product which will help keep my engine clean.
Many Thanks
Keith (07817328560) A call would be great any time
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1. Andy says:
  July 13, 2016 at 12:07 pm
  Get it cleaned manually and then use AR6900-D in the fuel and AR9100 in with the oil to prevent reoccurrence.
  Reply
Nigel Groves says:
July 11, 2016 at 9:12 pm
Hi there,
I’m considering the purchase of a 11 plate Volvo 80 2.4 diesel but I’m a bit concerned that the mileage at 46000 is low and depending on use,there could be carbon/ash/ build up problems- if I purchase it . What Archoil products do you recommend and more critically, what product do I apply first. Many Thanks. Nigel
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1. Andy says:
  July 13, 2016 at 12:09 pm
  Hi, regular use of AR6900-D or AR6400-D every 5k miles, depending on convenience. Regular use of AR6900-D is best but some don’t want the hassle of adding a product with every fill up so use AR6400-D now and then instead.
  Reply
Keith Johnson says:
February 19, 2016 at 8:25 pm
Hello Andy, touring around France and spain the engine light came on and it was on and off intermitently but mostly on. when the light was out that only happened when we stopped for for a break. If the problem is the EGR (as the hand book suggests) would AR6400D help. The vehicle is a motorhome with about 18000 mls on the clock, we service every year even though we dont do the recommended service mileage.
Many thanks
Keith
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1. Andy says:
  February 20, 2016 at 6:47 pm
  Probably 1 in 4 chance of making any significant difference if it is in fact the EGR system. Cleaning manually is the best bet followed by a fuel conditioner/catalyst to lower the fuel carbons and an oil additive or higher quality oil to reduce oil deposits in the EGR.
  Reply
Mohammed rahman says:
November 1, 2015 at 1:50 am
Hi Andy I have a vw passat cc 2011. 87k and an error has come up on the dash reading back as egr. Can you please contact me as I’d be happy to have it manually cleaned before having it entirely replaced. You may contact me via email or by phone on 07732522711. Thanks
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1. Power Enhancer says:
  November 27, 2015 at 4:04 pm
  Hi, contacted, let me know how you get on.
  Reply
Roger says:
October 15, 2015 at 4:32 pm
I had the spanner light on in Zarira 1.9 DTI 120 2006. I found the pipe from dpf to sensor had fractured, replaced light cleared. I then used the AR6400 D. I did many runs at 3500 rpm in 3rd to ensure plenty of heat. Engine runs fine it has requested one regen which it performed, not much smoke this time. My only problem now I have the engine management light on (engine shape symbol) I had this reset but returns. I have now used the tank of fuel with AR6400 D in. The fault code suggests an EGR problem. I have bought AR 6500 for next stage but would like any thoughts on my situation so far and next steps please.
Regards
Roger
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1. Andy Archer says:
  October 16, 2015 at 10:32 am
  On that engine I would recommend having the EGR system/valve cleaned manually and then using a fuel conditioner and AR9100 in with the oil to help reduce further build-up from both the fuel system and lubricating oil.
  Reply
  1. Roger says:
    November 3, 2015 at 2:57 pm
    I followed your advice, removed EGR valve, it was stuck, freed up and gave it a good clean. It took a few journeys but the engine management light now gone and all running well, thanks for help.
    Roger
    Reply
sean alker says:
March 31, 2015 at 9:07 am
Hi i have a ford fiesta 1.6 econetic iv taken it to a garage as the car seemed to be struggling when it was cold at first start up in first and second gear like it was going to stall the garage have put it on the diagonstic machine but its not bringing back any conclusive results so they suggested its either the injectors or the egr valve but the injectors are siezed in and there saying they will need to just replace the egr valve to even see if that works but not guaranting that its the problem. To then go onto the injectors and check each one but having to get somebody with a hydraulic puller to get them out so im going to be spending in excess of £400 to £500 just to diagnose the problem they have suggested trying first and egr cleaner like diesal treatment which i first tried with redex deisal treatment but after time it didnt do anything.
Reply
1. Andy Archer says:
  April 9, 2015 at 11:35 am
  Hi Sean. The garage should be able to diagnose this. I would have the EGR removed and cleaned manually. I would also replace the fuel filter if it hasn’t been changed in a while. You could use AR6400-D as a process of elimination in case there are injector deposits. Does the engine start easy enough or does it take a few cranks?
  Reply
Tyron Coullie says:
March 29, 2015 at 6:02 pm
My mk3 1.8 ford Galaxy tdci judders when accelerating. I have had the DMF and clutch changed by evens Halshaw ford. This did not help at all the problem still persists. Not only that, the diff carrier and carrier bearing has been changed as well as the drive shaft and they tried doing the wheel balancing and even went so far as to change all four wheels thinking there could be a flat spot on one of the tiers. But still the problem persists. The glow plugs have been checked. The suspension has been checked and the engine mountings. A friend of mine suggested that the EGR valve could be the culprit. I don’t have any management lights on. Any suggestions would be greatly appreciated. Many thanks. Tyron
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1. Andy Archer says:
  March 30, 2015 at 10:12 am
  Hi, it is really difficult to diagnose without inspecting the vehicle. I would need to listen and feel the judder. If it does feel engine related then inspecting the EGR would be a good idea as would using a high quality fuel system cleaner as a process of elimination. However, any competent mechanic should be able to diagnose this.
  Reply
2. Andrew Williams says:
  January 25, 2016 at 6:36 pm
  Try cleaning the MAF sensor.
  Reply
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