maximilianblade1
Mercedes C Klasse Diesel Engine Problem
Summary of the thread
A 2022 Mercedes C Klasse diesel is experiencing engine issues, including a check engine light, reduced power, smoke during acceleration, rough running, increased fuel consumption, jerking, and a loud hissing noise. The suspected cause is a faulty EGR valve. Another possibility mentioned is vacuum leaks, which can mimic EGR valve problems. After professional diagnosis, the EGR valve was confirmed to be jammed and was replaced, resolving the issues.
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4 comment(s)
maximilianblade1 (community.author)
Vacuum leaks, huh? Where exactly should I be looking for those? Is there any chance it could mess with the catalytic converter, or anything related to vehicle emissions?
horstmoore1
Vacuum lines are generally small rubber hoses connected to various engine components. Inspect them for cracks or disconnections. Regarding your catalytic converter, a malfunctioning EGR valve can, over time, impact its efficiency due to improper combustion. Given the severity of your symptoms, I would recommend a professional diagnosis to ascertain the precise issue and prevent further damage.
maximilianblade1 (community.author)
I appreciate the insight. I took it to a workshop, and you were spot on - the EGR valve was jammed solid. I got it replaced, and the bill came to 355€. Runs like a dream now. Thanks again!
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MERCEDES
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CKLASSE
horstmoore1
I had a similar issue with my Mercedes C Klasse, although I have the petrol version. The symptoms you describe certainly point towards the EGR valve. However, it would be prudent to also investigate potential vacuum leaks, as these can mimic EGR valve problems. Have you checked for any obvious signs of leaks around the engine bay?