Reedley Service Centre can now also offer diesel particulate filter service and repair for the most popular makes, including VW, Audi, BMW, Mercedes, Volvo, Range Rover, Jaguar, Ford, Peugeot and Renault.
How diesel particulate filters work
As with any other filter, a diesel particulate filter is designed to trap particles as they pass through the filter material.
In this case it’s exhaust soot particles that are collected by the DPF, which acts to lower harmful emissions from diesel engines.
It’s important that any DPF is regularly emptied of built-up particulates in order to maintain performance. The filter also needs to be cleaned regularly using a process called regeneration, of which there are three types: active, passive and forced. This regeneration process burns off the accumulated soot at extremely high temperature (around 600°c) to leave behind only ash residue, allowing the filter to collect more pollution from the engine.
Types of DPF regeneration
- Active regeneration
This process occurs while you drive the car, with sensors recognising when the filter load limit has been exceeded by reading exhaust back-pressure or the ‘soot load’ of the filter. Timing adjustments to fuel injection are then initiated which increases exhaust temperature, burning off soot to clear the filter. Active regeneration can also be initiated by the vehicle ECU every 300-400 miles, depending on vehicle use, taking around 10 minutes to complete.
- Passive regeneration
A process that depends on high exhaust temperatures burning off soot deposits while the vehicle is driving at higher speeds, for example on the motorway. In some vehicles the ECU can alter injection timing to control the process but passive systems are more prone to blocking, particularly if a vehicle is used only for short trips around town. If the regeneration process does not conclude this can lead to the filter clogging, and that’s where we can help!
- Forced regeneration
When the second-stage DPF warning light is illuminated your vehicle will go into ‘limp mode’ and should be brought to Reedley Service Centre as soon as possible. We will ascertain the extent of the problem and likely use software to control the ECU and initiate a force regeneration of the DPF. This will also require an engine oil and oil filter replacement.
When a DPF is unable to regenerated regularly it’s will block, potentially causing faults with the engine management system and/or software. This can necessitate repair and replacement, sometimes costing in excess of £1500.
The team at Reedley Service Centre have in-depth knowledge of these systems and can diagnose and repair your vehicle at a fraction of the cost of replacing the DPF.
If you have a DPF warning light showing on your dashboard or are concerned that your vehicle is not running as it should, don’t hesitate to get in touch.