Discussion
Which memory is lost when a battery is disconnected on a modern vehicle?
Answer: A
Idle adaptations, window one touch settings, radio presets and clock all reset, and some require a relearn drive. Fault codes are usually retained in non volatile memory. Immobiliser coding survives disconnection. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist. Checking which component actually carries the load settles most questions of this kind at once.
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