Problem with the Opel Mokka 2016: Black smoke, engine indicator light and loss of power

Hi guys, unfortunately there's an unusual problem with my 2016 Opel Mokka. When accelerating, it blows out black smoke, the check engine light comes on and the engine sometimes even switches itself off. I also notice a loss of power, rough engine running, jerking when accelerating, increased fuel consumption and it even stalls when idling, with the car shuddering. I suspect that the mass air flow sensor could be defective. How exactly should I check this? Has anyone ever had the same problems? Have you been to the garage for this and what was done to fix it? I would appreciate any experiences and tips.

(Translated from German)

4 comment(s)

Hi, I had a similar problem with my 2014 Opel Astra, I don't have much automotive experience but I was able to dig through it with the help of my garage. They determined that the damage to the wiring harness was the problem. The repair cost me 95.0 euros. To be more specific about how I solved this, it would be helpful if you could give me some more information about your car. Are there any other symptoms? How many kilometers has your Mokka run? Hope this helps a little!

(Translated from German)

Hey, thanks for the quick reply! My Mokka has now run 122526 kilometers. I hadn't really noticed any other symptoms. The last service was a few months ago and nothing out of the ordinary was found. Perhaps I should take a closer look at the wiring harness. Can you tell me more about the damage you had? 95.0 euros sounds really quite cheap!

(Translated from German)

Hi, they discovered a broken wire in the wiring harness to the mass air flow sensor in my Astra at the garage. This broken wire was sending incorrect signals to the control unit, which caused the problems you mentioned. As soon as the wire was repaired, the engine ran like clockwork again. And yes, the repair was pretty cheap because no spare part was needed. Just working time. I would recommend that you first check the cable from the mass air flow sensor for damage before replacing the entire sensor. A new mass air flow sensor can quickly cost a few hundred euros. But as I said, I'm not an expert, I'm just sharing my experience. The best thing to do would be to ask a garage that really knows its stuff. Hope this helps you! Good luck and let us know how it goes!

(Translated from German)

Hello, thank you very much for the detailed reply and the helpful tips! I will definitely check the cable from the mass air flow sensor and hopefully the fault will then be found. It's good to know that it doesn't necessarily have to be a complete replacement of the mass air flow sensor. I'll report back what comes out in the end. Thanks again and have a nice weekend!

(Translated from German)

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