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How to Replace Sequoia Oxygen Sensors

Oxygen sensors measure the amount of oxygen in your cars fuel system when considered in conjunction with other components. The sensors are in the exhaust system and allow electronic fuel injection and emission control technologies to exist. The sensor sends details about the concentration of oxygen in the exhaust emissions and the signal will trigger an adjustment for extra oxygen or extra fuel. Maintaining working oxygen sensors is important not only to your vehicles health but also the health of the environment.

Instructions

Upstream oxygen sensor

1

Turn on the car and run for one to two minutes to expand the exhaust pipes enough for easier removal of the sensor. Locate the upstream oxygen sensor on the front end of the exhaust pipe behind the manifold flange and near the catalyst. If the vehicle has a V8, the sensor will be located on the rear end of the manifold near the flange for the exhaust pipe.

2

Unplug the electrical connector from the sensor. Remove the sensor mounting nuts with an appropriately sized wrench or ratchet. Finally, remove the sensor and gasket. Discard the sensor, gasket and nut.

3

Apply anti-seize compound to the threads of the new sensor. Using the new gasket, replace the sensor being careful not to contaminate and damage the surface with dirt or grease. Tighten the sensor into place using the replacement nut.

Downstream oxygen sensor

4

Locate the downstream oxygen sensor behind the rear catalytic converter (for all 2001 and later model) or behind the single catalytic converter (for 2000 models) in the exhaust pipes. If the vehicle is equipped with a V8, the sensor will be upstream of the converter in each exhaust pipe.

5

Unplug the electrical connector from the sensor. Remove the sensor mounting nuts with an appropriately sized wrench or ratchet. If the vehicle has a heat shield, remove it as well. Finally, remove the sensor and gasket. Discard the sensor, gasket and nut.

6

Apply anti-seize compound to the threads of the new sensor. Using the new gasket, replace the sensor being careful not to contaminate and damage the surface with dirt or grease. Tighten the sensor into place using the replacement nut.