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Could an oil change cause 02 sensor to malfunction in a 1996 Honda civic?

No, an oil change should not cause an oxygen sensor to malfunction in a 1996 Honda Civic. The oil change process involves draining the old oil from the engine and replacing it with new oil, and this should not affect the operation of the oxygen sensor.

The oxygen sensor is a separate component from the oil system and works by measuring the amount of oxygen in the exhaust gas to help control the air-fuel mixture. If you're experiencing issues with your oxygen sensor after an oil change, it is more likely due to a coincidence or another unrelated factor.