That voltage 8.44V looks a bit low, that would explain the struggle to turn over and the error might be just the result of low voltage. Check the battery condition and charge level and connections from battery
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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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