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There should be 2 O2 sensors on that vehicle. The first one is on the engine side of the Catalytic converter that is the upstream o2 sensor and the second one primarily comes after the catalytic converter down the exhaust pipe.Depending on the age of your vehicle you will need a wrench ( and possibly a snipe) to take the old o2 sensors off. Also be sure to disconnect the harness before loosening the 02 sensor and disconnect the battery negative terminal for 30 seconds to erase the engine code and turn off your check engine light

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Q: How do you replace the o2 sensor on a Pontiac Sunfire?
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How can you bypass o2 sensor on 1999 Pontiac sunfire?

You can not.


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It depends on which o2 sensor.


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