maradunkel1

Mercedes X Klasse Diesel Running Lean

My 2019 Mercedes X Klasse diesel is running lean and it's driving me nuts. Seriously reduced power, the check engine light is on, the engine's running rough, and it's jerking when I accelerate. I'm thinking it's the fuel injectors. I've checked the mass air flow sensor, throttle body and even the oxygen sensor. Any thoughts?

4 comment(s)

Sounds rough! I had a similar issue with my old Vauxhall Astra different engine, but same symptoms. Check engine light, power loss, the works. Turned out to be the fuel injectors in my case too. Did you check for any codes? That check engine light should have thrown something. Could also be a vacuum leak somewhere.

Thanks for the quick response! I pulled the codes and it's definitely pointing towards a lean condition. I'm leaning towards the fuel injectors, but I'm not sure how to test them properly without pulling them all out. Any tips on that?

Testing them in place is tricky. Based on your symptoms and the codes, I'd say it's worth getting them checked professionally. Could save you a lot of time. My injector replacement sorted the issue.

Appreciate the advice! Took it to the workshop and you were spot on, fuel injectors were bad. Replaced all of them and it's running great now. Cost me 515€ but worth it. Thanks again!

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