LeoWeber

Black smoke, loss of power and NOx sensor defect

Hello everyone! My 2008 BMW 3 Series petrol engine is currently doing strange things. It blows black smoke out of the exhaust when accelerating, the check engine light is on, there is a loss of power and an exhaust leak, plus a strong exhaust odor. I suspect that the NOx sensor could be defective. Do you have any advice or experience of how you have solved such problems, especially in the workshop? I am grateful for any tips!

(Translated from German)

The 2008 BMW 3 Series is experiencing issues such as black smoke from the exhaust, loss of power, an exhaust leak, and a strong exhaust odor. The NOx sensor is suspected to be defective. Possible causes could be a faulty NOx sensor cable connection, a need for regular service, or issues with the air filter, fuel injectors, and turbocharger. The suggested solutions include having the car serviced, getting the fault memory read out at a garage, and having a professional conduct a diagnostic scan.

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5 comment(s)

Hi, I had exactly the same problem with my 2006 BMW 5 series, my car knowledge is somewhere between low and somewhat, so I know a bit about cars. I went to the garage and they found that the NOx sensor cable connection/plug was faulty. They fixed it for 385 euros and since then the problem was gone. Could you tell me what model your BMW 3 series is and how many kilometers it has driven? With a little more information I might be able to help you better with what you should do next. Hope this helps!

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Hey, thanks for your quick reply! My BMW 3 Series is an E90 335i, but it already has quite a bit of mileage on it, namely 214781 km. So the NOx sensor sounds plausible, I'll have it checked at the garage. It had its last service almost exactly a year ago, so maybe I should tackle that again. Thanks for the tip!

(community_translated_from_language)

No problem, always happy to help! Given the mileage of your car, your assumption about the NOx sensor could well be correct. A regular service is of course always advisable, as this simply keeps the car running smoother and prevents any major damage. Next time you're at the garage, simply have the fault memory read out. That could give you an idea of what the problem is. And they could also take a look at the exhaust. Keep your fingers crossed that it's nothing major! Let me know when you know more. Good luck!

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Hello and thanks for your further advice! I will definitely tackle the service and sort out the NOx sensor and exhaust check at the garage. I really appreciate your help, it's good to have someone who understands these things. I'll get back to you as soon as I know more. Thanks again and take good care of yourself! See you then!

(community_translated_from_language)

Hi! The black smoke and check engine light could indicate a faulty NOx sensor, but I would also consider checking the air filter, fuel injectors, and turbocharger. A diagnostic scan by a professional can help pinpoint the exact issue. Good luck!

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BMW

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