lillyhoffmann2

Sprinter engine light and rough running issue

My 2005 Mercedes Sprinter, gasoline engine, with 140108 km on it, is throwing a check engine light and running rough. Smells like exhaust is leaking somewhere, and the exhaust fumes are really strong. I'm suspecting an exhaust treatment malfunction. I've checked for obvious leaks, but nothing jumps out. Could a bad lambda sensor really cause all this, or am I looking at something worse like the catalytic converter or even the EGR valve? I even wondered about the particulate filter, but I don't think this model has one. Any ideas before I resign myself to the mechanic and a hefty bill?

4 comment(s)

I had a similar engine light and rough running issue with my Sprinter. Did you happen to notice if the engine light comes on immediately or after driving for a bit? Also, does the engine seem to struggle more at certain speeds or under load? It could be the lambda sensor, but a faulty catalytic converter can cause those symptoms as well.

The engine light usually pops up after about 15-20 minutes of driving, and yes, it seems to struggle more when going uphill or accelerating quickly. When you had the issue, did it also smell strongly of exhaust? I'm just trying to get a clearer picture before I potentially shell out a ton of money. And if it was the catalytic converter, what was the cost?

Yes, I remember that awful exhaust smell. It was quite noticeable. I would suggest you take your vehicle to a workshop. They can properly diagnose the issue. In my case, it turned out to be the lambda sensor. Hopefully, it's something similar for you.

Thanks for the insight! I took it to the workshop, and you were spot on. It was indeed a defective lambda sensor. The whole repair, including the new sensor and labor, came out to 375€. At least it wasn't the catalytic converter! I really appreciate your help in narrowing down the possibilities and sharing your experience.

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