I'm having the exact same issue with my '04 Grand Prix GT. Warnings came up one day. I pulled over and restarted the car (assuming something just started up wrong) and the lights were gone for an 8 hour drive. A week later they came back and would go off and on for about a month. Then stayed for a few weeks before going off for a month with no recurrence. Now, it is on and won't go off....
I've talked to a few work shops and have received (in my opinion) rather high estimates of how much it would cost. $80 - $100 just to read the code (between Firestone and a Chevy dealer). And they estimate that if it were a wheel speed sensor that it would run about $300 for parts and labor.
Do these numbers seem right? Any suggestions on how to do any part of this cheaper?
