drivetrain malfunction bmw 640d – any ideas?
BMW 6 Coupe (F13)
5 
1345 
20.05.23 Back to topics
electrical fault
BMW
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@user_2052535 Dec 05, 2023MemberI have a 2004 series 5 automatic BMW the battery goes flat .I have had the battery and alternator tested all good When I put an ammeter in series with the battery it shows a drain of 4amps {some 48 watts ] ,This is with the car doors closed and the ignition key out of the car Without having to draw each fuse in turn to try and find the fault any suggestions ?
Reply 05.12.23 
05.12.23 -
@Hersten Dec 05, 2023MemberIt was the same on my car, after searching everything the electrician said that the problem is in the IBS sensor, if I am not mistaken, it is in a black case on the terminal itself. The electrician did something with it and all the problem went away. I can not say more precisely because he did not disclose to me the information that was inside. Maybe you should have someone check it. It was in my car but I can’t tell you exactly what’s wrong with yours.
Reply - BMW 5 Touring (E61) 520 d@user_11367 Dec 05, 2023MemberAs @Hersten suggests, the IBS sensor on the battery would be the first thing to check. This is a common issue with the E60/61.Reply
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