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      12-19-2012, 12:31 AM   #2
Mike Benvo
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Drives: 08 E90 M3 / 400whp Turbo 7
Join Date: Apr 2008
Location: SoCal

Posts: 4,603
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Garage List
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
2008 BMW M3  [5.00]
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You're better off posting in the e90 section since this section is mainly for M3's.

Failing batteries can cause a host of issues and tons of fault codes. If you suspect it might be the battery, measure voltage with the car on and with the car off. With it on you should see 13.8 to 14.3. With the car off you should see 12.2-12.7.

If there is no issue there then proceed with diagnosis of what would cause those faults.

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