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BMW 523i abs light on - Unusual Autos
2000/W
Bmw 523i tourer
Was fine now intermittent abs comes on and stays on ,brakes all ok
Light then stays out for days any ideas?
BMW 523i abs light on - Screwloose
UA

Only one way to go on this; get someone with a scanner to plug it in and find out which fault-code is putting the light on.
BMW 523i abs light on - Aocal
Or buy one yourself off E-Bay for less than £100!