Mercedes Ml350 Egr Valve Fault

sammmo | 11:48 Mon 15th Apr 2024 | Motoring

5 Answers

The EGRvalve in my Mercedes ml350 is faulty. The car has been driving ok but today I've noticed a slight knocking noise and smoke coming out of the exhaust when excelerating. Would the EGR valve cause this or could it be something else.

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Hymie

Here’s some information on the working of the EGR valve – they even offer a free check (on the EGR valve) if you scroll down to the end.

https://www.evanshalshaw.com/blog/what-is-an-egr-valve/

davebro3

Have you got an EGR warning light or fault code?

EGR valves do get incredibly filthy but I don't think it would be the cause of excessive smoke. Smoke suggests oil is being burnt so oil may be getting into the cylinders - worn valve guides or tappets?

What's you mileage?

sammmo

Question Author

I'm not exactly sure if it's the EGR valve. The fault is P2459 diesel particulate filter regeneration frequency. Does anyone have any idea how to fix that.

davebro3

Often a sign that the car isn't being run far enough/long enough to get the catalytic converter up to temperature. Take it for a good run & see if that cures it (the fault code may have to be erased using a code reader).

Or it could be a sensor problem.

davebro3

https://www.ecufiles.com/obd-codes/p2459-diesel-particulate-filter-regeneration-frequency/#:~:text=The%20P2459%20code%20signifies%20that,the%20exhaust%20of%20diesel%20engines.