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If and when you are able to stop the black smoke, as you seem to be determined to do so, please let me know what you finally did to stop it.
Regards,
Ian
Just to say that I have the same problems, I have a 2015 diesel, when I bought it in march 2021 it had 19500 miles on it with a full service history, it failed it's MOT in December 2020 on emissions then apparently passed, my first MOT was December 2021 passed but warned that the emissions were...