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This might be a stupid question but is it normal to be able to scan engine ecu fault codes with ignition off?

Evening everyone Im hoping someone can point me in the right direction. I bought a a3 8P 3.2 Quattro with what I thought was a dash cluster fault. Most of the time the car is fine but sometimes when i go to start it the dash wont wake up. iv also noticed that the milage and clock doesn't...