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DaviWirth92

Mercedes X-Class Diesel 2017: Symptoms and experiences with knock sensor

Poor fuel economy

Loss of engine power

Check engine light on

Jerking on acceleration

Weird engine noise

Hey guys, am a bit worried about my 2017 Mercedes X class diesel with 144706km mileage. The car is showing some concerning symptoms such as check engine light, loss of power, jerking on acceleration, poor fuel economy and weird engine noises. I had a nasty experience at my last mechanic visit and I now suspect it could be the knock sensor. Has anyone had similar problems before and can tell me how their visit to the garage went? Thanks in advance!

(Translated from German)

4 comment(s)


MaxWeberFan

Hey, I drive a 2014 Mercedes E-Class diesel and had similar symptoms to yours a few months ago. For me it was actually a cable/plug fault. The check engine light and strange engine noises were really annoying. I also noticed this jerking when accelerating. My mechanic was able to find the fault after a bit of troubleshooting. A broken plug was then replaced and a damaged cable repaired. It wasn't a trivial fault, but my mechanic said it was necessary to repair it to prevent anything worse. My car has been running great again since the repair and I haven't noticed any more of these symptoms. So it's quite possible that your X-Class has something similar. Hope this helps you.

(Translated from German)

DaviWirth92 (Author)

Hey, thanks for your quick response. I'm a little reassured to hear that it wasn't a major fault in your case and could simply be fixed with a cable/plug fault. Do you happen to remember how much the repair cost you and whether any other problems have arisen since then? It would be helpful to know what costs I should be prepared for. Thank you very much!

(Translated from German)

MaxWeberFan

Hey, sure, no problem. The repair cost me around €95 to fix the faulty cable/connector. I was really relieved, I have to tell you. And as far as the knock sensor is concerned, everything has been running smoothly again since my visit to the workshop - it was actually malfunctioning. But since then there have been no further problems and my car is running like clockwork again. So don't worry, hopefully it's the same with your sled. All the best!

(Translated from German)

DaviWirth92 (Author)

Hey, that's a real relief to hear! 95 really sounds like a reasonable investment considering how much a new car would cost. And good to hear that no further problems have occurred since. You've really given me hope that my X Class might be similar. Thank you so much for your help and words of encouragement. Well, I'm going to head to the garage and hope it's just a minor problem. Wish me luck! Thanks again!

(Translated from German)

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