MichiRacer

Black smoke and loss of performance in the 2010 Audi A4 diesel: possible sensor problems in the low-pressure fuel system

Hello friends, my 2010 Audi A4 Diesel with an impressive 214,853 km is showing some unusual symptoms. During acceleration, black smoke comes out of the exhaust, the check engine light is on, the engine shuts off by itself and runs unevenly, jerks when accelerating and loses power. In addition, there is excessive consumption and a strong exhaust smell, and it stalls at idle. I suspect the problem is with the sensor in the low-pressure fuel system. Have any of you had similar experiences and can give any tips? What are your experiences with mechanics with similar problems? Many thanks in advance!

(Translated from German)

4 comment(s)

Hi, I had a similar problem with my 2013 Audi A6. The "Check Engine" light was also on, with similar symptoms to yours, including smoke and jerky acceleration. It wasn't a sensor problem, but a defect in the turbocharger. Unfortunately it wasn't a small problem, the whole job took almost a week. My mechanic had to take the turbocharger completely apart and partially replace it. So don't jump to conclusions, there could be something bigger behind it. You should definitely take it to a trustworthy mechanic who knows Audi well. Have it checked before you drive any further, it could cause serious engine damage. Hope this helps you. Good luck!

(Translated from German)

Hey, thanks for your reply and your advice! That sounds like a real repair odyssey. It's especially good that you pointed out this point about the turbocharger again. Can you remember how much you ended up paying for the repair? Did anything else crop up afterwards or has everything gone smoothly since then? Thanks again!

(Translated from German)

Hey, no problem, always happy to help! Well, I had to pay a lot for the repair of the turbocharger, but it was worth it. But you know what? Since I've been to the mechanic, the car has been running like a kitten. Tell me, your problem was the sensor in the low-pressure fuel system, wasn't it? I had that once too. They replaced the low-pressure fuel sensor and it cost me €172 at the time. But since then everything has been running great and the sensor works perfectly. I hope this helps you - don't mess with it yourself, get a specialist to do it. It's worth it.

(Translated from German)

Hey, that sounds like a satisfactory outcome, even if the initial costs were high. The important thing is that your car has been running perfectly ever since. To be honest, I would never have thought of doing it myself! I think I'll follow your advice and take my Audi to a specialist. The cost of the fuel low pressure sensor still sounds reasonable. Thanks again for your help and advice. Have a good trip with your kitten!

(Translated from German)

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