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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 09-19-2007, 08:30 PM   #1 (permalink)
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ABS Diagnose Issue

Here's the story. 1998 manual 528i with sports/premium package.
Bought the car with ABS/ASC lights on. Took it to an independent BMW dealer. The scan tool said front right speed sensor is out, so replaced it and cleared the codes. On the test drive, the car started braking on it's own at exactly 12km. The light came on again, and from then on drove alright. Back to the shop, cleaned the RF sensor, rechecked, cleared codes and test drove again, with same results, being at 12kmph the car braked by itself and the light came on again, and would drive ok(system shut down?)

Brought back, put the scan tool on the port and test drove withe tool attached while tech watched the screen in the passenger seat. The RF sensor indicated 5km, when the other 3 wheels indicated 15km (same all the way upto 30km)


I suggested the new sensor is faulty. The hub was replaced on the same wheel by previous owner, and the tech says the hub may have been installed wrong, and results in a wrong reading from that wheel, or the module is faulty. I'm going to switch the front sensors around tommorow and do a little test of my own. Anyone else had a similar issue guys? Thought of checking before I started throwing any more $$$ away.

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Old 09-20-2007, 01:38 AM   #2 (permalink)
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Definitely could be the sensor.

Also, know that ABS modules on the E39 fail quite regularly.

You might also try cleaning the contacts on the ABS plug in the engine bay with rubbing alcohol. My cousin's E39 528is had ABS module symptoms that went away permanently just be cleaning all of the contacts.
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Old 09-20-2007, 08:25 AM   #3 (permalink)
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Heloo m3uond,

Thanks for that tip. I'll certainly do the alcohol thing before pulling out anything else. It's cheap and my experience with alcohol has been always great!!!

Will let you know how it goes.

Thanks again

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Old 11-05-2007, 07:09 PM   #4 (permalink)
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Does anyone know whether the speed sensor for 97 to 98 e39's differ from 99 onward models? I'll be very grateful if someone with a manual can give me the correct part number for a 1998 e39 528i.

Thanks

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Old 11-13-2007, 01:27 AM   #5 (permalink)
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try RealOEM.com Online BMW Parts Catalog for the part #
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Old 11-13-2007, 02:25 PM   #6 (permalink)
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This is a great link. Thanks a million
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Old 11-14-2007, 01:38 AM   #7 (permalink)
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YW, also you can try BMW Parts and Accessories Catalog
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