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Mercedes S Klasse Uneven Engine Running Issue

My 2023 Mercedes S Klasse with a gasoline engine is acting up. It's got 122118 km on the clock and has developed an annoying uneven engine running issue. The check engine light is on, there's an error stored, and it's jerking when I accelerate. Could this be a timing belt issue, engine misfire, spark plugs, or fuel pump? I'm leaning towards an exhaust leak. Has anyone experienced something similar?

4 comment(s)

Rough idle and jerking? Sounds familiar. I had a similar issue with my S Klasse. Did you check the exhaust system for leaks? That was my problem. It caused all sorts of weird engine misfire codes.

Exhaust leak, huh? Interesting. Was it obvious, or did you have to hunt for it? And did it throw any specific codes that pointed you in that direction, or was it more of a process of elimination?

I had to hunt for it. The code was pretty generic, something about 'system too lean'. Honestly, I'd suggest getting it checked out by a workshop to be sure. Much easier than messing around yourself.

Thanks for the tip! Turns out, you were spot on. Took it to a workshop, and they found a small leak in the exhaust system. Cost me 265€ to repair, and now it runs like a dream. Appreciate the help!

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