2001 BMW X5 E53 3.0 160K miles
Got codes for MAF replacement.
Also, transmission light came on after changing bad alternator.
Disconnected battery & transmission light went off.
Past few days, car runns fine but transmission light came back and downshifts hard..
Replaced MAF & disconnected battery again and transmission light went off (shifts fine now) but truck runs like crap.
Bad acceleration, feels like misfiring

Scratching my head!