Mercedes CLA Belt Handover Problem

My 2023 Mercedes CLA with a gasoline engine is giving me fits. The belt-handover has stopped working entirely. Mileage is at 135778 km. I suspect a defective belt bringer/handover itself. Anyone else seen this? It looks like automobile maintenance is going to cost me around 455€ with the belt drive, serpentine belt, tensioner pulley and belt tensioner.

4 comment(s)

Whoa, that sounds rough. I've got a CLA too, and I had something similar happen. The belt started squealing like crazy, and then I noticed the tensioner pulley looked like it was wobbling. Could that be it? Did you check the tensioner pulley itself?

Wobbling, you say? Hmm. I haven't specifically looked for that. When you say 'similar', was your belt handover also failing? Was it an obvious wobble, or something subtle I should be looking for?

Yeah, the belt handover was definitely failing. The belt kept slipping off the tensioner pulley, and it was pretty obvious once I looked closely. I wouldn't mess with it too much myself though, I'd take it to a workshop before it gets worse.

Appreciate the insight. It did end up being the belt tensioner. Replaced the whole thing. All good now. Thanks!

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