My brother and I just spent a lot of time troubleshooting a problem with my 2001 Pontiac Grand Prix GTP. The ABS (anti-lock braking system), the TCS Off (traction control system) and the service engine soon warning lights were all illuminated on the dash.
I put together a troubleshooting web page with all of the possible solutions and pictures to help illustrate the procedures.
Here's the link -
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I hope it helps someone save a bit of money and time.
Cheers, Paul Michaels Ft. Lauderdale, FL