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BimmerLink app with an adapter (like VeePeak OBDCheck BLE/ BLE+ for exemple) and a multimeter are the minimum you must have with that car.
Battery is the 1st step before anything else.
Bunches of e84 had a recall for the B+ positive cable connection at the fuse box (behind the glove box). It can corrode or become loose, causing heat damage and loss of power.
The battery’s life is around 7-8 years. Should replace after that. Mine was fine to start the car after 9 years but voltage was around 11.8V at rest. So, some equipements were falling in limp mode. Last month at -30C /-22F, the car wasn’t able to charge the battery more than 60% and I had problems even with a 4 yo battery…
Voltage must be higher than 12.2-12.5V at rest and be 14.4-14.8V when charging. Should’nt drop less than 9.0-9.5V when starter is fonctionning.
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