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luisasky9

Citan engine fault after chip tuning

My 2017 Mercedes Citan with a gasoline engine is throwing a fault code and feels like it's lost half its power. Mileage is sitting at 153665 km. I used an auto scanner and it shows an error, but I suspect it's related to chip tuning the previous owner had done. Has anyone else run into this?

Summary of the thread

A 2017 Mercedes Citan experienced a fault code and significant power loss, suspected to be linked to previous chip tuning. The issue was confirmed to be related to the chip tuning after a workshop visit. The solution involved reverting the vehicle to its original settings, which resolved the problem and restored normal engine performance.

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4 comment(s)

GebiMan

I had something similar happen with my Citan. Reduced engine power, error code popping up. I did a car diagnostic myself with a scan tool, and it was pointing to something weird with the engine management. Was yours tuned before?

luisasky9 (community.author)

That's exactly what's happening to me! Engine management sounds right. Any idea what the fix was, or did you just end up taking it to a shop? How did you confirm that chip tuning was the problem, my scan tool doesn't confirm it?

GebiMan

I'm no mechanic, but I'd say it's the chip tuning. Mine was the same after some aftermarket modifications. I just took it straight to a workshop in the end, they sorted it out. Best not to mess with it yourself, could do more damage.

luisasky9 (community.author)

Right, workshop it is. Thanks for the heads up. I took your advice and went to the workshop. Turns out the chip tuning was indeed the culprit. They reverted it to the original settings, ran another vehicle diagnostics to clear the fault code, and now it's running smoothly again. Bill came to 180€. I appreciate the help!

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MERCEDES

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CITAN