At 11.55V battery does not look too good while doing scan, this could be dropping to under 10V while cranking and preventing car from starting. Looking at voltage reading and supply voltage errors I would say it's either discharged, bad or poor connection for +12V or ground.
Charge battery, measure battery voltage with multimeter at the battery and on the car, check how much voltage drops while cranking.
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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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