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How to Replace the O2 Sensor on a 2000 Honda Civic

Replacing the oxygen (O2) sensor in your 2000 Honda Civic can improve the vehicles idle, fuel economy and engine performance. The O2 sensor reads the percentage of oxygen in the exhaust gases as they exit the engine, then converts that information to milliamps--these are used by the engine management computer to adjust the air/fuel mix going into the engine. If a sensor fails, the engine will run very rough and even stall during driving.

Instructions

1

Raise the front of the car with a jack, then support the car on a set of jack stands. Slide under the car, just behind the front wheels, and locate the O2 sensor on the catalytic converter.

2

Disconnect the electrical connector on the O2 sensor pigtail from the connector on the main wiring harness by releasing the locking tab and separating the two halves. Place an O2 sensor socket on the sensor, then turn it counterclockwise with a ratchet, removing the sensor from the catalytic converter.

3

Insert a new O2 sensor into the threaded hole in the catalytic converter and turn it clockwise, using an O2 sensor socket and ratchet to tighten it. Connect the wiring harness connector on the car to the pigtail connector on the O2 sensor, pushing them together until the locking tab snaps in place.

4

Slide out from under the car, raise the car off the jack stands with a jack, then remove the stands from under the car. Lower the jack, setting the car on the ground, then remove the jack from under the car.