1999 4WD Blazer has the ABS light coming on, started intermittently
and now is on pretty much all the time.
Local shop hooked the scanner and it showed it to be an issue with the
RF wheel (something like, "speed not constant"?).
I thought it would be an issue with the sensor but to my surprise they
said it might be a wheel bearing.
Would a wheel bearing cause that MIL and code?
Yes it could be a bad hub assembly. BUT the common problem is that rust
forms under the sensors. This causes the sensor to move away from the
toothed wheel inside the hub, which causes the signal to fluctuate.
The easy solution can be DIY IF you have the tools.
Pull the wheel/tire off.
Then use a brush to clean all the dirt/crud from around the sensor. Get
it as clean as you can.
Now remove the bolt that holds the sensor in. Then GENTLY pull the
sensor STRAIGHT OUT. if you try to pry it off center you will probably
Once you have the sensor out use a rag or wood dowel to plug the hole in
Now clean the rust and dirt from around the hole. Clean the tab and
sensor very well also.
Now remove the plug from the hole and reinstall the sensor.
Once you have the sensor in I like to use a brush and coat the sensor
tab and around it with some non hardening sealer. This keeps the
water/air out and slows the rusting.
Get the code cleared and then see what it does. I recommend cleaning
BOTH sides so that they send the same signal levels.
On Sun, 17 Jan 2010 17:15:26 -0800, burboun firstname.lastname@example.org (burboun
Could be, but not as likely as either a dirty sensor face, or a
misadjusted sensor. Remove, clean, and reinstall (to the correct
clearance with the tone ring) and see if the problem goes away.
I do take it you don't have any other symptoms that would indicate a
bad wheel bearing, right?
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