Quote:
Originally Posted by B21
Its essentially imperative that you replace the battery with a decent AGM 70ah or 80ah battery and make sure its registered / coded as required..
With 30+ ECUs on board the E89..many of which don't know how to /expect to cope with a poor battery all sorts of both temporary and permanent faults can manifest themselves..hope that's clear enough?
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B21 is correct. I replaced the battery in my Z4 last spring with this one which you should be able to find in FL.
https://www.walmart.com/ip/EverStart...0-CCA/40685088
I used BimmerCode/BimmerLink to code the battery, but oddly enough the old battery didn't show up, so either it wasn't coded, or it's an issue with the app. The old battery was a BMW battery but I couldn't find a date code on it. The model number of the battery was last produced in 2013.
While you are replacing the battery I recommend replacing the salmon colored relays too since they are right next to the battery. Genuine BMW part number 12631742690 (12 63 1 742 690). I think they are about $20 each.