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Old 07-02-2012, 10:37 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,986
Mein Auto: 02 BMW 525i M54 auto 130K
Weird things happen to bimmers when you don't have reliable power:
- One user's experience debugging a half-dead instrument cluster (1) which, after testing the fuses (1) battery & alternator (1) thankfully turned into an alternative battery search (1) and a simple battery replacement DIY (1)

You can easily check the power using this information:
- DIY how to test a BMW battery & alternator

I would suggest the OP read this post which shows how to check the speed sensors in about five minutes:
- How to diagnose the BMW ABS BRAKE DSC/ASC trifecta (1) & why the 5-minute ABS DIY quick test doesn't always work, especially on brand new non-OEM wheel speed sensors, by Quick99Si (1)

Note: All of these are from the bestlinks.
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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