Modern diesel vehicles have a special type of exhaust silencer fitted known as a particle or particulate filter (DPF). Over a period of time, these filters can start to become blocked and cause a reduction in power.

In most cases with German vehicles such as BMW, Audi, Volkswagen and Mini, the car’s own engine management senses this and automatically starts a process during driving to burn off the excess soot. Unfortunately, this can also be stopped by the engine management system without the driver being aware.

Some people have had their DPF removed to get around the fault, but as of February 2014, it has been included as a failure in the MOT test. This is due to the fact that it falls under the government’s Road Vehicles (Construction and Use) Regulations (Regulation 61a(3))1, which states; ‘To use a vehicle which has been modified in such a way will mean it no longer complies with the air pollutant emissions standards it was designed to meet.’

At David Paul of Warrington, we are fully conversant with DPF problems. We have vast experience of finding both the cause and solution to your vehicle’s DPF fault, and in 90% of cases this can be without the need to replace the DPF, which can be expensive.

So if you live or work in and around Warrington and have DPF problems, contact us on the number below.

Advice for using BMW DTC system (always consult your owner’s handbook for a more detailed explanation):

1. Default position when you start the car:

The DSC+ system is active. The car has full stability and traction control. This means that the engine power will be cut if the driving wheels start to spin.

2. DTC on – Short press of the DTC button:

When you engage DTC, the DSC system remains active, but the limits at which it will intervene are increased. So the car will wheelspin a bit before engine power is reduced.

3. DSC+ off – Hold DTC button for more than 5 secs

This turns the traction and stability control systems off. The driver has full control and the engine power will not be reduced, no matter how much wheelspin you get or how far the car gets out of shape in a bend.

Officially, BMW state that DTC is for low traction situations, e.g. mud, gravel or ice. However, it’s pretty clear that it’s also designed to allow for a more sporting drive. Motoring journalists often describe it as emulating an electronic limited slip diff.

Contact David Paul of Warrington on 01925 818900