On a 2009 era car, what are the likely implications of leaving the battery disconnected for 3 or 4 weeks assuming it is fully charged when it is put back?
ECU re-learning, radio re-coding etc. Can it cause any major or long term harm?
Presumably any re-flashing of the ECU does not get lost as I guess it would be in some form of ROM non volatile memory.
Same question if it's only a day or two?
Not sure I will need to do it but just checking in case.
