Check the measuring blocks for misfire, I think it's around 17-19 to see if misfires affect all cylinders equally or some cylinders or one bank more than others to determine if it's general problem or only for some of cylinders.
It is possible that engine have experienced mechanical damage due to over-revving going by error code and that this damage causes misfires.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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