Mercedes CLA check engine light and rough running

My 2022 Mercedes CLA with a gasoline engine is giving me fits The check engine light is on, and it feels like I'm driving a tractor It's got 86414 km on the clock I'm getting reduced engine power, the engine runs rough, it jerks when I accelerate, and sometimes it even stalls at idle I've heard it might be a mixture preparation error Could it be the mass airflow sensor Or maybe something with the air-fuel ratio I'm kinda freaking out

4 comment(s)

Sounds frustrating I had a similar issue with my CLA Check engine light kept popping up, and the car felt sluggish For me it was a faulty injector Think of it like a clogged artery; fuel can't flow properly, messing with the air-fuel ratio Has anyone checked the intake manifold for leaks

An injector, huh That sounds expensive How did you figure out it was the injector and not, say, the mass airflow sensor or something else messing with the air-fuel ratio And what exactly does checking the intake manifold involve

The workshop ran some diagnostics and pinpointed it They said the injector wasn't spraying fuel correctly, causing a rich mixture at times Best to get it checked professionally, could save you a lot of guesswork and money in the long run It cost me around 500€, but it solved all the issues

Okay, I understand Thanks a lot for the advice I took it to the workshop, and you were spot on – it was a defective injector The repair cost 515.0€, but now it runs like new Really appreciate your help

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