During the regeneration process, the soot that has built up inside the DPF is removed. This is done by allowing the DPF (catalytic converter) to reach temperatures up to 600 C.
This allows the soot to burn up and be pushed out with the exhaust gasses. This process is done passively or can be a forced regeneration.
Passive Regeneration
Your Mercedes will automatically start the regeneration process while you are driving without you even knowing.
Unless the check engine light is on for another reason or certain criteria are not met, which can cause the regeneration process to never be completed.
If the regeneration process does not start on its own, you will eventually get too much soot built up, that one or more of the codes mentioned above will be triggered.
Forced DPF Regeneration
You can force Mercedes DPF regeneration with a professional diagnostic scanner such as Mercedes Star Diagnostic. Regeneration can be carried out with the vehicle driving or running but parked.
During this process, certain conditions must be met and the engine RPMs will be kept in 2000 for approximately 30 min. The procedure must be initiated by the scanner.
There are several conditions that need to be met some of which include:
- Engine coolant need to reach the normal operating temperature
- Catalytic converter needs to be over 200C as a starting point
- Turn on lights and rear defroster
- Set climate control to blow at max speed
- Hood needs to be closed
These are only a few of the conditions as they vary between models. The scanner that you will be using will display all the steps you need to follow to carry manual DPF regeneration.