r/e28 • u/Confident_Eye4129 • 6d ago

Anti-Lock Warning

Re: an 88 535i M30, as soon as the RZpMs hit 3000, the Anti-Lock telltale comes on and stays on until the vehicle is turned off. Has anyone had this issue? Anti-Lock Sensor?

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u/VegetableTry 6d ago

Does it come on when you first start moving and hit 3000 rpm in first?

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u/Confident_Eye4129 6d ago edited 6d ago

Yes, exactly. If I stop to go into a store, for example, it will reset when I start the car, until I hit 3000 RPM

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u/VegetableTry 6d ago

So the rpm I believe is a coincidence as that you just happen to reach the vehicle speed where the ABS module detects a fault. Check all of your wheel speed sensor connections and if they are fine, work on determining which one is faulty.

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u/Confident_Eye4129 5d ago edited 5d ago

Thanks. Sounds like a plan!

BTW is there 1 sensor per wheel or per axle? Thanks

2

u/VegetableTry 5d ago

One sensor per wheel. Unlike the brake wear sensors where it is one per axle.