Black smoke and loss of power in VW Polo petrol engine 2012: Questions about mixture control

Hey, I had similar problems with my 2015 VW Golf TDI. In my case, it was the injection system that caused all the problems. I mean, imagine, the car jerked and smoked when accelerating, just like yours, and smelled really unpleasant. The check engine light was on and it took a long time to start. When I took it to the garage, they discovered that the fuel injectors were broken and needed replacing. That was a pretty serious problem because it can seriously damage the engine if you don't tackle it in time. In your case it could also be the injection system, especially if the mixture is too rich. Hope this helps you in some way. All the best with your Polo!

(Translated from German)

Hey, thanks for the quick reply! Interesting to see that you had similar problems with your Golf. Can someone remind me how much it cost you to change the injection system? And have you noticed anything else since then, or has your car been running like clockwork ever since? Have a nice day and thanks in advance!

(Translated from German)

Hey, no problem, I'm always happy to help! The fuel injection system was really a lot of money, it cost me around €250. That was specifically for the defective fuel pressure regulator. Since I went to the garage, the problem with the mixture control (mixture was too rich) has been solved. My Golf now runs like clockwork again, no more jerking or smoke. I'm sure your Polo will soon be fit again, hopefully without a hole in your wallet! Have a relaxing day everyone.

(Translated from German)

Hey, that's really good news that your Golf is running smoothly again. 250 sounds a lot, but when I consider that it can prevent serious damage to the engine, it seems worth it. I will definitely take it to a garage as soon as possible and hopefully they will get my Polo running again. Thanks again for your help and have a relaxing day too.

(Translated from German)