E46 325 rear abs sensor fault after changing wheel bearing & arm
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  1. #1
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    bmw325coupe's Avatar
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    rear abs sensor fault after changing wheel bearing & arm

    we had a faulty wheel bearing on the bmw only 6 months after changing the same one. we changed the whole arm, just incase it was something else causing it to fail, and as the bushes were shot, we bought a second hand replacement. wheel bearing now sorted.

    problem is, now the abs, traction control and (i) brake lights are on

    with this secondhand arm, it already had an abs sensor attached to it, so we thought we may as well use that one, looks like a bad idea now the lights are on, so going to swap it for my old one, but that has fused itself to the arm, so soaking it overnight, if it doesnt come off i may just buy a new one.

    now the one that came off the car had a grey connector, and this secondhand one has blue, both bmw parts, and i didnt think anything of it.
    however now looking at a replacement part, october 2001, seems to be a crossover point for different sensors, does the colour of the plug tell you which sensor you need, and could that be the reason the light is on?

  2. #2
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    Easy way to tell is if the car is connected up to diagnostics then driven you can check the live readings and see which sensor is playing up, also you can read the fault codes and see if the same side is showing a fault.
    Can you see a part number on the ABS sensor at all?
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  3. #3

    fernando629's Avatar
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    Quote Originally Posted by bmw325coupe View Post
    we had a faulty wheel bearing on the bmw only 6 months after changing the same one. we changed the whole arm, just incase it was something else causing it to fail, and as the bushes were shot, we bought a second hand replacement. wheel bearing now sorted.

    problem is, now the abs, traction control and (i) brake lights are on

    with this secondhand arm, it already had an abs sensor attached to it, so we thought we may as well use that one, looks like a bad idea now the lights are on, so going to swap it for my old one, but that has fused itself to the arm, so soaking it overnight, if it doesnt come off i may just buy a new one.

    now the one that came off the car had a grey connector, and this secondhand one has blue, both bmw parts, and i didnt think anything of it.
    however now looking at a replacement part, october 2001, seems to be a crossover point for different sensors, does the colour of the plug tell you which sensor you need, and could that be the reason the light is on?
    Hope you read this, same exact problem. Did you fix yours?

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