Engine Mechanical problem
1995 Chevy Corsica 6 cyl Front Wheel Drive Automatic
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152000 mi. above 60 mph the engine service light comes. It resets itself when you turn the engine off. I replaced the O2 sensor once already.

O2 sensor faults should not go off once set. You have a '95 before OBD II was required, it is a soft code speed or load related. I would get the codes checked at a parts store with the light on to get more information