Firenza L4-121 2.0L (1983)
Oxygen Sensor: Service and Repair
1.
Disconnect battery ground cable.
2.
With engine temperature above 120°F disconnect electrical connector and remove sensor.
3.
Reverse procedure to install. Coat oxygen sensor threads with a suitable anti-seize compound and torque sensor to 30 ft. lbs. On 1984-87 models
equipped with 4-121 overhead valve engine, remember to install shield when replacing oxygen sensor. If a new shield is not used, an air
leak will occur, resulting in a false Code 44 or rich system operation.
