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If you are driving slowly everywhere in your large diesel, the DPF will become blocked. With that in mind, here are 5 ways to fix a blocked DPF: The main reason DPF’s get blocked is due to short trips and town driving. The cost of cleaning or replacing your DPF sounds scary but you can forget this following some simple driving habits.

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How to Clear a Blocked DPF and Keep it Clean If the warning light continue to display, you will notice the following symptoms: However, sometimes these warning lights can be false alarms and you should try clearing the fault using an OBD2 diagnostic tool. Error codes such as the DPF light or EML (Engine Management Light) will be the first symptoms of a failing DPF.

High mileage car that will find regeneration harderĪs the majority of DPF’s are installed on newer cars, you will more than likely have a trip computer.

Turbo failing with oil dripping into the DPF.

Incorrect engine oil upon servicing the car – ( Low Ash + Low Sulphur required for DPF Cars).

Faulty fuel injectors sending too much fuel to the air/fuel mixture.

Clogged EGR Valve increasing diesel soot passed to the DPF.

Short journeys where the engine doesn’t reach optimum operating temperature.

The most common reasons for DPF failures are: How long until a DPF will fail is hard to tell because some manufacturers have had to replace some in the first 3 years and some never. The main reason for DPF’s failing is due to car owners not doing enough miles and driving too frequently in city areas. Sadly DPF’s do fail and many diesel car owners do not realize how they are causing a blocked DPF. Its important that this is done as soon as possible because once the car reaches 85% soot level, the DPF will need to be removed and cleaned. The diesel car will enter limp mode and will require a car diagnostic tool to force the regeneration. Forced DPF Regenerationįorced is where the Active regeneration could not occur that has resulted in the soot levels reaching 70% and above.

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Manufacturers that use a passive form of regeneration typically install a oxidizing catalytic converter near the engine to increase the temperature. The exhaust will reach these temperatures will occur mostly on prolonged highway driving. Passive will take place once the exhaust reaches optimum temperatures where the regeneration will automatically begin. Once initiated, the timing of the fuel injection will alter that will result in the exhaust temperature increasing to burn the soot particles.ĭuring an active DPF regeneration, you may notice the following:

Active DPF RegenerationĪctive reads the back pressure of the exhaust or soot load of the filter to determine when to begin the regeneration. There are 3 different types of DPF regeneration, which are active, passive and forced. After the regenerating of the DPF, it can now restart the cycle of collecting harmful exhaust gases again. The collected diesel soot particles are burnt off at high temperatures, which results in an “ ash-like” after product. The Diesel Particulate Filter traps the harmful diesel gases that gets cleaned regularly by a process called DPF regeneration. How to Clear a Blocked DPF and Keep it Clean.