Diesel Particulate Filter Warning Light: Causes and How to Fix It

If your vehicle’s warning light for the diesel particulate filter is on, it’s time to clean or replace the filter before the limping mode kicks in. Diesel engine car owners often face this dilemma, thus it’s important to be prepared for it.

What Causes Diesel Particulate Filter Warning Light?

A clogged diesel particulate filter (DPF) is the main culprit behind the DPF warning light. When this light comes on, it means that the onboard computer has identified too much soot in the particle filter, which could cause limp mode to be activated.

Problems with the pressure or temperature sensor might also cause the DPF warning light to come on. This part is responsible for sending the incorrect signals to the vehicle’s computer system, which could cause the DPF warning light to go off for no apparent reason if it fails.

The primary cause of the DPF warning light to illuminate, however, is an excessive accumulation of soot in the vehicle’s particle filter.

How Do I Fix My Diesel Particulate Filter Warning Light?

A vehicle could go into limp mode if the diesel particulate filter gets too clogged up with soot over time. You should get this fixed right away because it could cause major damage to your car.

You can learn how to fix your car’s diesel particulate filter warning light by following these options. To turn off the DPF warning light, carefully use the solutions provided below.

Drive beyond 40 mph to trigger regeneration

Increasing your speed beyond 40 mph is the most typical way to fix the DPF warning light. If you want to do this, you’ll need to find a large stretch of roadway and escape the crowded area of your city.

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Get going at least 40 mph and keep the engine revved up to about 2500 rpm once you’re on the road. The result is an increase in temperature due to the automatic activation of active regeneration.

Once the blockages are transformed into gas, they will be released through the exhaust. Make sure to give the vehicle a good 15 to 30 minutes of stretching. Afterwards, you should see the DPF warning light turn off.

Apply DPF cleaning additive

If your DPF filter becomes clogged, you might try using a DPF additive instead. You can obtain a high-quality DPF cleaning for around $13 to $26 and just add the solvent to your petrol tank.

Be careful to apply the amount exactly as directed by the manufacturer. After that, turn the key to the ignition and go for a drive of fifteen to thirty minutes.

After 30 minutes of driving, the DPF warning light will go out on its own as the additive works its way through the fuel system. “How long is it safe to drive with the DPF light on?” Quickly resolving the issue is recommended.


Knowing what to do when the diesel particulate filter warning light comes on is crucial. If you don’t do the workout, your automobile could enter limp mode, which would be a major problem.

Above, we revealed both the source and the remedy to the DPF warning light display. To stay out of trouble, make sure you pay attention to those details.

Quickly implement the fixes suggested in this article if your car’s DPF warning light has already been activated. However, please seek the assistance of a professional technician if you are unsure how to fix the problem thoroughly.

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