How to use a DPF cleaner spray?

by Alex

Expert answer:

Quick answer

Spray-based DPF cleaners often require removing the sensor or pipe to access the filter interior. You apply the foam or liquid into the DPF, let it soak to dissolve soot, then run the engine to expel residues. Always follow product instructions closely.

Detailed answer

DPF cleaner sprays differ from in-fuel additives. Instead of adding to your tank, you physically introduce the cleaning product directly into the filter area. This approach can help dissolve or loosen stubborn soot that normal regens can’t budge. The spray typically foams up and seeps through the filter channels.

Steps to use a DPF cleaner spray:

1. Locate an access point: Often, you’ll remove a temperature or pressure sensor from the DPF housing to create an opening. Some vehicles have a designated service port.
2. Shake and spray: Follow the instructions on the can. You usually spray in intervals, allowing the foam to expand. Ensure you use the correct nozzle or adapter that comes with the cleaner.
3. Soak: The foam needs time—often 10–15 minutes—to break down the soot or carbon deposits. Avoid rushing this step.
4. Reattach sensor: Carefully reinstall the sensor, making sure no damage or misalignment occurs.
5. Run the engine: Start up and go for a drive, ideally at sustained speeds. This helps the filter reach the temperatures needed to burn off the dislodged gunk. You might see some white smoke or extra exhaust at first.

Each product has its own guidance, so read the label thoroughly. Some require you to keep the engine off during spray application; others want a warm engine. Also, not every brand suits every type of DPF, so check compatibility. If you do it incorrectly—like skipping the soak time—you might not get results.

Once you’re done, watch for signs of improvement, such as the DPF warning light turning off or a livelier throttle response. Remember, a spray is a temporary measure. If your DPF is heavily blocked or physically damaged, a foam cleanse might not be enough. You could need a forced regen or professional cleaning.

Take care to use gloves and safety goggles; the foam can be caustic. Also, dispose of any residual fluid responsibly. If the product drips from the exhaust, do so in a place where you can contain the run-off. Ventilate your garage or work area well, as some sprays can produce potent fumes.

In short, a DPF cleaner spray can be a handy DIY solution, particularly if you catch a partial blockage early. It’s cheaper than pulling the filter for a full-on workshop clean. Just follow the instructions to the letter, drive the car suitably afterwards, and keep an eye on your dashboard lights to see if the cleaner has done its job.

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