The turn signal switch in the steering column may fail causing the turn signals not to work on one or both sides.
Car problem reports
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Most reported 2001 Pontiac Sunfire problems
A door window may move slowly or stop in mid travel due to a failing power window motor. The affected window may start working again after the motor cools off. Replacing the faulty window motor will commonly correct this concern.
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
The serpentine belt tensioner can fail; it may become noisy and/or the belt may jump off. Replacement of the failed tensioner will be necessary.