Quote:
Originally Posted by patents
It's either your battery or your starter. How old is the battery?
FYI: If you replace the battery, it must be registered in the car's computer, and if it isn't in the same exact spec (AGM vs. non-AGM, aH rating, etc.), then it must also be coded.
If you have access to a BMW code scanner there may be shadow codes to help with the diagnosis.
Have the battery tested and charged. Starters are a common failure in these cars. Sometimes a starter failure sounds like a bad battery (slow cranks) - it did on mine.
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Does the battery still need coding even if you hold the charge via a booster during the change?