I have a 2001 GTP, and the ABS sensor on the right front wheel hub was the problem. Apparantly it's somewhat common, you can do a search on here and there are a few threads about it. It's an easy check if you can get under the car, look at the wires leading to your hubs from the harness behind your tires, and if they look ate up, that's your problem. Bad news is you can't replace the sensor without replacing the whole hub. Also the bearings going in the hub are pretty common and will cause the same light, you can check that by listening for a grinding noise while driving or jacking the car up, and pulling on the top and bottom of your tire, if it has any play back 'n forth its probably a bad hub bearing.
