How to Replace an 02 Sensor On a 1997 Mazda Protege

The 1997 Mazda Protg has a single oxygen sensor threaded into the exhaust manifold. When the sensor fails, it will trigger the "Check Engine" light on your cars instrument panel, and your cars gas mileage will substantially decrease. If you want to avoid losing money at the gas pump, purchase a new sensor from an auto parts store and replace it at home.

Instructions

1

Raise the Protg with a jack and secure the car on jack stands. Locate the oxygen sensor threaded into the exhaust manifold. The exhaust manifold is located beneath the intake at the base of the engine and is connected to the exhaust pipe. The oxygen sensor resembles a spark plug threaded into the manifold with an electrical wire connected to the top.

2

Pull the electrical connection apart to disconnect the wiring harness from the sensor. Remove the oxygen sensor from the manifold with a wrench.

3

Coat the new sensor threads with anti-seize compound. Insert the new sensor by hand. Tighten the sensor with the wrench. Push the electrical connection together until it locks.

4

Raise the car slightly with the jack. Remove the jack stands and lower the jack to return the car to the ground.