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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?

A 2023 Mercedes S Klasse with 122,118 km is experiencing uneven engine running, a check engine light, and jerking during acceleration. Possible causes considered include a timing belt issue, engine misfire, spark plugs, fuel pump, or an exhaust leak. After consulting with others who had similar issues, an exhaust leak was identified as the problem. Repairing the exhaust leak resolved the issue, restoring smooth engine performance.

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6 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!

Mercedes GLE, during an overtaking maneuver I encountered an unevenness in the terrain, then it started pulling the steering wheel in all directions. I could barely regain control with light brake presses because when I pressed the brake harder, I almost overturned. What happened? I can't figure it out.

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Mercedes GLE, during an overtaking maneuver I encountered an unevenness in the terrain, then it started pulling the steering wheel in all directions. I could barely regain control with light brake presses because when I pressed the brake harder, I almost overturned. What happened? I can't figure it out.

It sounds like you might be dealing with a suspension or steering issue, possibly related to the alignment or a component failure such as a tie rod or control arm. This is a safety-relevant issue, so I strongly recommend having a professional mechanic inspect your vehicle as soon as possible to ensure everything is functioning correctly. Let me know how it goes or if you have any further questions!

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MERCEDES

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SKLASSE