Internal resistance too high probably refers to heater element in lambda sensor. This means that heater element is not working and it takes longer for it to heat up and start working but it is still working. So no need to change it in hurry unless you mostly do very short trips.
Part number is 077 906 265 J for V8
06A 906 262 BF for V6
Not sure if it is the "easier" one, on PF it is pretty much about the same
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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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