Hello Oli
wheres engine 1 in the scan , does it have battery regulation on the vehicle .
Follow earth lead off the battery .....does it go to module before it terminates to earth .
Could be a battery like already said ,but could also have a drain on it .
Ideally you need to put a amps meter in series between the battery lead and see how much draw you have as the draw rate gives you a clue as to whatever may be staying awake or pulling low amps out
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