Chris_Less

Mercedes B-Class 2013: Starting difficulties, loss of power and black smoke - possible mixture control errors?

MERCEDES

B Class

| 2013 | | Gasoline

Longer cold start time

Loss of engine power

Poor fuel economy

Strong exhaust smell

Check engine light on

Black smoke from exhaust on acceleration

Jerking on acceleration

Hi guys, I'm having some problems with my gasoline 2013 Mercedes B Class that has 68110 km behind it. When I start it especially while it is still cold, it takes longer than usual. While driving I have loss of power and it jerks when accelerating. The exhaust system blows out thick black smoke and smells bad. In addition, the fuel efficiency is poor and the "Check Engine" warning light comes on all the time. I suspect it could be a fault in the mixture control (mixture too lean). Have you ever had similar problems and how did your garage solve the problem? I didn't have the best experience with my garage last time, so I'm looking for your advice and recommendations. Thank you very much for your help!

(Translated from German)

4 comment(s)

AndiHillerTop

Hello, I had the same problem with my 2010 Mercedes E Class. It turned out that my lambda sensor was defective. These were exactly the symptoms I had - poor performance, jerking when accelerating and the warning light was on. The whole thing was quite serious because the lambda sensor ensures the correct mixture of air and fuel in your engine. If this sensor is faulty, it can lead to higher fuel consumption, loss of power and even engine problems. The strong exhaust fumes could also indicate a faulty lambda sensor. At my garage, they ended up having to replace the lambda sensor. You say it could be a fault in the mixture control, it could well be the lambda sensor. So my advice is to go to the garage and have it checked. It's really not good if the lambda sensor is broken. Good luck with that!

(Translated from German)

Chris_Less (Author)

Hey, thanks for your quick reply! Sounds like exactly what's going on with my B Class. And replacing the lambda sensor sounds like a good plan. Do you remember how much you left at the garage for the repair? And has anything else come up since then, or has your Mercedes been running smoothly ever since? Thank you!

(Translated from German)

AndiHillerTop

Hi, no problem, I'm glad if I can help! The repair of the lambda sensor cost me €375 at the time. It wasn't cheap, but since then the problem with the mixture control has been solved. Since I got my car back from the workshop, it has been running like clockwork again. So nothing else has come up since then. Hope this helps you and your Mercedes B Class will soon be back in shape! Keep your fingers crossed!

(Translated from German)

Chris_Less (Author)

Great, thanks for the info! 375.0€ isn't exactly cheap, but if it really fixes the problem, then it's definitely worth it. I'm glad to hear that everything has been going well for you since then. I hope I can do the same with my B Class. I will follow your advice and let the garage know about the lambda sensor. Thanks again for your help and hopefully my Benz will be back on the road soon! Maybe I should switch to electric then if there are any more problems haha. Let's keep in touch and thanks again!

(Translated from German)

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