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Problems with Mercedes GLA Class Diesel 2015: Check Engine lights up and possible cause - fuel filler flap position sensor

Hey guys, I'm having a few problems with my Mercedes GLA Class Diesel built in 2015. The check engine is lit, the warning light in the speedometer is on and the error is stored. I suspect that the position sensor of the fuel filler flap could be to blame. Do any of you have similar experiences or troubleshooting tips? I'm curious how you solved the problem in the workshop!

(Translated from German)

4 comment(s)

Hi, I had a similar problem with my 2013 Mercedes GLC Class Diesel. I'm not a car guru, but I do have a bit of experience. In my case, the control unit was broken. I took my car to the garage, they replaced the part and voilà, everything was fine again. But it also cost me a hefty 1000 euros. Do you think it could be the same problem? Do you know which error codes were stored? With a little more information, I might be able to help you better.

(Translated from German)

Hey, thanks for the tip! It could well be a problem with the control unit, yes. Unfortunately, I don't have the error codes to hand. I only know that it has something to do with the fuel flap sensor. My last inspection was at 151802 km and everything was still OK. So the whole thing is a bit suspicious. I just noticed that the warning lights only came on after refueling. Maybe it does have something to do with it? I'll probably have to take it to the garage after all. Do you have any other advice? Many thanks in advance!

(Translated from German)

Hey, no problem, happy to help. Well, the refueling thing does sound a bit suspicious. It could well be that the fuel filler flap position sensor is causing a fault. Have you tried whether the warning lights go out when you close the fuel filler cap properly? Sometimes minor problems such as a fuel filler cap that is not fully closed trigger these warning lights. But that's just a thought. And of course, the workshop is certainly the safest solution. They can check the error code and diagnose the problem more precisely. If it really is the control unit, it's a rather expensive affair, but if it's "only" the position sensor, it should be relatively cheaper. Let me know when you know more. Keep your fingers crossed!

(Translated from German)

Many thanks for your advice! Yes, I've already tried the fuel filler cap, but unfortunately that didn't change anything. I'll keep your suggestion in mind though and tell the people at the garage. I was already thinking that the control unit could be an expensive issue...really hope it's just the position sensor. I'll keep you posted as soon as I know more. Thanks again for the help!

(Translated from German)

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