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What causes DPF failure?
January 24, 2019 Char Lee
In Uncategorized

Unfortunately, despite their benefits, DPF’s do fail and many diesel car owners do not realise they may be helping to contribute, by not doing enough kilometres and driving too frequently in city areas.

It is hard to predict when a DPF will fail, because some manufacturers have had to replace some in the first 3 years and some never.

The most common reasons for DPF failures are:

Short journeys where the engine doesn’t reach optimum operating temperature
Clogged EGR Valve increasing diesel soot passed to the DPF
Faulty fuel injectors sending too much fuel to the air/fuel mixture
Incorrect engine oil upon servicing the car – (Low Ash + Low Sulphur required for DPF Cars)
Turbocharger failure with oil dripping into the DPF
High mileage vehicle will find regeneration harder

Symptoms of a Blocked DPF Filter 

As the majority of DPF’s are installed on newer cars, you will more than likely have a trip computer. Error codes such as the DPF light or EML (Engine Management Light) will be the first symptoms of a failing DPF.

However, sometimes these warning lights can be false alarms and you should try clearing the fault using a OBD2 diagnostic tool. If the warning light continue to display, you will notice the following symptoms:

Loss of power
Reduced fuel economy
Poor throttle response
Harder or failure to start
Limp mode (most likely)
Bad smells

The main reason DPF’s get blocked is  short trips and city driving. With that in mind, here are 5 ways to fix a blocked DPF:

Drive Faster. If you are driving slowly everywhere in your large diesel, the DPF will become blocked. Increase your speed and plant your foot to floor to when accelerating to increase exhaust temperature and clear soot levels.

Increase Your RPM. If the DPF light is on, your best bet is to drive at high RPM’s for a prolonged period until the warning lights turn off. This will increase the gases going through the DPF, thus clearing it and increasing the temperature.

Avoid City Centres. If possible, you should avoid slow traffic where possible, especially if you are nearing your DPF limit or have the light currently on.

Check EGR Valve. If you have problems with your EGR valve, it will be even harder to clear the DPF. Fix the EGR issue and then try the other steps.

Use High Quality Fuel.

Premium fuels or diesel fuel cleaners include fuel additives that help burn off harmful particles.If you are currently in limp mode, driving at high RPM (step 2) will be your best chance of getting out of limp mode. Once you have normal power, go for a long fast drive on high quality fuel. If the issue remains the next day, get your error codes read by a diagnostic tool.

DPF Australia fills the demand for more realistically priced Diesel Particulate Filters and associated diesel products, and supports the Australian motor trade with technical support.

An Australian based company with extensive technical knowledge, DPF Australia offer you a quality product and great service at a price which is significantly lower than OE DPFs, and a great range of stock right here in Australia.

Call: 1300 896 505