Why hasnt anyone told him about the common issues of having black smoke coming out the exhaust.
Do a compression check, my money is on the piston rings.
Also check on the PCV and stem seals to see how their condition is like.
I've had the same problem before OP in my previous em1. Piston rings and stem seals are the usually where to look 1st. I wouldn't bother with the sensors at all, cos if its a sensor you will get an engine light.
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