erwinjones10

Mercedes A Klasse Hybrid Engine Trouble

My Mercedes A Klasse hybrid, build year 2021, is giving me some trouble. It's done 133754 km and the check engine light is on. I'm experiencing reduced engine power, rough running, and it stalls sometimes at idle. There's also jerking when accelerating. I think it might be related to mixture preparation. Any ideas?

A 2021 Mercedes A Klasse hybrid with 133,754 km is experiencing engine trouble, including reduced power, rough running, stalling at idle, and jerking during acceleration. The check engine light is on, and the issue is suspected to be related to mixture preparation. Possible causes include a defective fuel injector or faulty oxygen sensor. The recommended solution is to have the vehicle diagnosed at a workshop, which confirmed a defective fuel injector as the problem, leading to successful repair.

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4 comment(s)

Sounds like you've got a classic rich mixture issue! When you say mixture preparation, have you noticed any black smoke from the exhaust or a strong fuel smell? A defective fuel injection valve or injector is a prime suspect, as you suggested. But it could also be a faulty oxygen sensor feeding incorrect data to the engine management system. I would also check the spark plugs. Are they fouled?

No smoke or fuel smell that I've noticed. I haven't checked the spark plugs myself, but could a problem with the intake manifold also cause this?

While a leak in the intake manifold could cause some running issues, it's less likely to be the sole cause of a rich mixture. A faulty injector is a far more common culprit, especially with those symptoms. To be safe, I'd suggest getting it checked out at a workshop with diagnostic tools. They can pinpoint the issue pretty quickly.

Thanks for the advice! I took it to a workshop, and you were right – it was a defective fuel injector. The repair cost me 515€. Runs perfectly now.

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MERCEDES

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AKLASSE