lillyhoffmann2
Sprinter engine light and rough running issue
Summary of the thread
A 2005 Mercedes Sprinter is experiencing a check engine light and rough running, with a strong exhaust smell, suggesting a possible exhaust treatment malfunction. The initial suspicion is a faulty lambda sensor, but concerns also include the catalytic converter or EGR valve. After consulting with others who had similar issues, it was confirmed that the problem was indeed a defective lambda sensor, which was resolved with a repair.
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4 comment(s)
lillyhoffmann2 (community.author)
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?
selinajones5
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.
lillyhoffmann2 (community.author)
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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MERCEDES
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SPRINTER
selinajones5
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.