I have a 2003 Grand am SE1. I recently replaced both wheel bearings due to ABS sensors not working. I now have a roaring noise coming from the front end and is very noticable going around corners.
Since the noise was not there prior top replacing the wheel bearings, I took it back to the shop that did the work and they are telling me it is not the bearings and that it is just road noise. Any thoughts?
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THE ABS WHEEL SPEED SENSORS ARE PART OF THE WHEEL BEARING ASSEMBLIES.THEY ARE A 2 WIRE HALL EFFECT SENSOR. DISCONNECT THEY HARNESS AND USE A DVOM (DIGITAL VOLT OHM METER) SET ON AC VOLTAGE AND SPIN THE WHEEL WHILE CONNECTED TO THE SENSOR IN THE WHEEL BEARING. IF YOU DONT GET A READING REPLACE WHEEL BEARING. IF YOU DO ITS A WIRING ISSUE BETWEEN SENSOR AND ABS MODULE.
sounds like you may have a bad wheel bearing. The first thing to do is find out what code is in the abs computer. You will need a higher end scan tool to do this. Once you know what sensor is causing the light to come on you can focus on that wheel.
I suspect the bearing is probably bad enough that you could spin each wheel by hand and hear it growl. It also may be sloppy if you push/pull each wheel at the 12 and 6 o'clock position.
this sensor is is built into the hub bearing, the bearing must be replaced to replace the abs sensor, 99% of sensor fault is due to worn bearing. the sensor is on the hub follow the abs wire to sensor from wheel area, some model sensor is bolted into bearing and can be replaced with bearing, make sure there is no play in wheel or new sensor will go bad, heres a picture of the complete hub and also of just the sensor. note there are four sensors one on each wheel, a scan tool will tell you which one is bad.good day.
Can't be 100% sure but if you didn't have this problem before doing the work on the wheel bearing I can only think 1 of two things. When they removed your whhel bearing the sensor ring for the abs got damaged or the abs sensor is damaged or not pressed into place in the knuckle. The front sensors are not screwed on, they just have a little sleeve and at time with the vibrations of doing a wheel bearing they get loose. You most probally won't have an abs fault due to these problems.
it is a bearing and hub assembly, average price is around $200 US
There are 2 designs, the cheaper ones have external ABS sensor, the more expensive has ABS sensor built into the hub assy..
here is a picture of the hub assy w/built in ABS sensor.