If the low traction light and the ABS light are on, chances are the system is reading at least one wheel turning faster than the others, and is interpreting this as a slipping tire. I'm not sure how much the measured speed difference needs to be to turn the system on - maybe even an undersized spare tire could do it.
If you know it isn't the tires, you may have a problem with one of the wheel speed sensors. These detect the slots in the edges of the brake rotors. Check the wiring harness to the speed sensors - it gets a lot of abuse on the bottom of the car. A replacement rotor with different slot spacing could also cause the problem.
If the sensors and wiring are good and not sending false signals, then the ABS controller is at fault.
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