Mercedes CLK EGR Valve Issue

My 2009 Mercedes CLK with a gasoline engine has about 146104 km on it. I think the EGR valve is defective. The check engine light came on, and the car has reduced engine power. I also see smoke when accelerating, rough engine running, and higher fuel consumption. It jerks when accelerating, and there is a loud hissing. I suspect the EGR valve is jammed. Can a defective EGR valve damage the catalytic converter and increase vehicle emissions? Has anyone had this happen before? I want to get it fixed quickly. Any ideas?

4 comment(s)

Yeah, your symptoms sound familiar. I had a similar issue with my CLK. Check for a vacuum leak around the EGR valve first. That hissing noise could be a clue. You might need a new EGR valve assembly. A faulty EGR valve can affect vehicle emissions.

Thanks for the quick reply. When you say vacuum leak, where should I look? Also, if the EGR valve is faulty, is there a risk to the catalytic converter?

Check the hoses connected to the EGR valve and intake manifold for cracks or looseness. A bad EGR valve can cause the catalytic converter to overheat over time because of unburnt fuel. I would visit a workshop to replace the EGR valve.

Thanks for the insights and advice. It seems a workshop visit is needed. The repair cost was 355€. I appreciate the help.

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