Two problems related to o2 sensor have been reported for the 2002 Chevrolet Trailblazer. The most recently reported issues are listed below.
Electronic exterior rearview mirrors and power seat engage and operate by themselves. Dealership cannot fix the problem. The memory for the mirrors and seat would not keep their position. When the consumer entered or exited the vehicle the systems would reset to a new position. Occasionally they moved while the vehicle was in motion. The dealer has replaced many components but the problem still exist. The check engine light illuminated. The dealer replaced the oxygen sensor. The a/c control mode button became stuck and was noisy. The dealer replaced the a/c module head. The left windshield wiper chattered and skipped. The dealer replaced the wiper insert. The 4wd switch fluctuated between 4wh and a4wh. The dealer inspected the vehicle and replaced the transfer case select switch.
The brake light went out multiple times without warning. The dealer was aware of the problem. There were no incidents to report at this time. The consumer stated when the vehicle was warm, the was a noise in the front end, the dealer replaced the axle seal and bearing, the O2 oxygen sensor was replaced. The 4-wheel drive was inoperative.