The fault code is for heating element of lambda sensor, very unlikely to cause misfires. The sensor in question is precat on the downpipe. Not sure about 40V but on 32V it's fairly accessible from the top if you have lambda sensor socket also there is not much space.
If you have VCDS check the measuring blocks for misfires to see if they are random or mostly on 1 cylinder or on 1 bank.
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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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