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ok,the check eng light in that car is only supposed to come on when the o2 sensor gets stuck in one place and doesnt change voltage[usually 0.00 or too lean---or 1.00 meaning too rich] and it doesn't happen immediately.usually 3-4 mins.you can check this by unplugging o2 sensor with engine running and watch the cel light.poss cause of your problem is the heater in the o2 sensor.i think it is powered by a relay[your car should have the mas relay that i think has this job]if power drops out to o2 sensor and catalyst or pipe cools[cold ambient temps and not enough revs to keep warm enough---you need 300deg centigrade]light may come on----just a thought.
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