I have 1998 vw beetle abs light is on not always you get in car start it ok start driving reach about 1200 rpms it comes on stays on shut car off it goes off until you drive and reach that certain rpm only comes on when car moves
The abs light is telling you that it's got a fault code in its system. You need to scan the car's abs system. The proper scan tool like vagcom will tell which component is causing a problem, even which particular wheel sensor if that's the issue.
its mostly likely a bad wheel bearing and sensor Most speed related issues are with most makes of cars. Have the car scaned at a vw/audi specialist shop since they should have vagcom scanning software to scan your car. if they dont move on to the next shop.
Deathjam4 you have a good point about the wheel bearing play causing an abs sensor failure. I'd forgotten about that.
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