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Whenever the ABS warning light comes on in the instrument cluster and it stays on it means the systems electronic control module (computer) has detected a problem in one or more of the inputs to the module, an ABS fault code is present as long as the ABS light is on. So what must be done to correct this? You must have the ABS electronic control module scanned with a special tool to read the fault code, then a trained technicain will diagnose and repair the defective part or wiring. Most times this is a wheel speed sensor (one for each wheel) that gives an erratic signal. While the light is on all you have is regular non-ABS brakes.
It could be the ABS system. Like the computers and electronics, not the braking components. Also, on a lot of cars, when you have that light and fix the items that are causing it, the light will stay on. Sometimes you can just disconnect the battery for 20 min to reset the ECU but that doesnt work on all cars. It may need to have the system cleared with a code reader. Did you take it to NAPA or somewhere to have the codes read, that will tell you exactly whats wrong with it. Otherwise you end up spending tons of money replaceing items that dont need to be.
Disconnect the positive termanl on the battery for about 3 min. reconect the battery the computer should be reset. Drive the car for about 30 min. if it takes that long to get to the inspection station then drive there and it should pass as long as the light hasn't come on prior to arriving at inspection station.if so see how long it takes for light to come on go about that far away from inspection station disconnect battery and try again.
for the m.ot the light has to be on then go out. i cant see why this cant be fixed, it must not be working. what i have seen to blag a mot is, a wire from the oil pressure switch to the abs light, when off on and running out, this works but leaves the car no abs, you sure not a sensor or the brain died
the abs light will always stay on even if you pull abs main fuse ,usually its awheel sensor on frt hubs ,broken wire around upper control arm,you can visually inspect,i will not recomend pulling abs light from dash.
u can have the light scanned by autozone free of charge. Also in new york state the anti lock system is not part of inspection and can not be a failable issue. Ofcourse your state may be differant. Also the abs light will not turn on for brake pads.. Most common on the olds alero is a bad wheel bearing. The abs sensor is built into all the wheel bearings. The code that u can get out of the car will even tell you what wheel it is that is causing he light to come on. Unless ofcourse its not a wheel bearing and its a internal abs system issue. Let me know what the code is and I will try to get you a pinpoint place to look....