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In our 2008 X5 4.8L we started having the high battery drain. If the car sat 2 days the battery was dead. My wife had gone to Sams and had them install a new battery but they did not install a AGM. This made our problem worse.
I picked up a cable and software to read my computer and it turned out that our pass side mirror was sending a bad reading to my computer. Fixing the mirror stopped my battery drain. I guess the computer does not go in sleep mode if it reads a bad return.
Who thought of this great idea?
The mirror did have a corroded connection but all functions worked before and after I cleaned the connections.
Buy the cable and get the computer program to read your system or you will never fix one of these cars.
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