3.8L - O2 Sensor Upper

NOTE: When replacing an O2 Sensor, the PCM RAM memory must be cleared, either by disconnecting the PCM C-1 connector or momentarily disconnecting the Battery negative terminal. The NGC learns the characteristics of each O2 heater element and these old values should be cleared when installing a new O2 sensor. The customer may experience driveability issues if this is not performed.

After removing the sensor, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771- 64 or equivalent. New sensors have compound on the threads and do not require an additional coating. Tighten the sensor to 28 N.m (20 ft. lbs.) torque. See Fig 1.

Fig 1: Upstream O2 Sensor
Courtesy of DAIMLERCHRYSLER CORP.

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Connect the heated oxygen sensor electrical connector. See Fig 2.

Fig 2: O2 Sensor Connector
Courtesy of DAIMLERCHRYSLER CORP.
Connect the negative battery cable.