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Thats weird, I have a hard wired dash cam thats on 24/7 and while I constantly get high battery drain warning it hasn't drained the battery fully. I've had it parked outside in low 10s overnight outside and it had no issues. Seems like it has to be an issue with Something is pulling power thats not supposed to overnight. I would say try the egr but I doubt it drains it fully from just one night. Do you have any accessories connected to the car?
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