Removal - Downstream 1/2 - 2.4/3.3/3.8L

Disconnect the electrical connector. See Fig 1.

Fig 1: Downstream Oxygen Sensor

Courtesy of DAIMLERCHRYSLER CORP.

1 - OXYGEN SENSOR CONNECTOR

2 - CATALYTIC CONVERTER

3 - DOWNSTREAM OXYGEN SENSOR

4 - ENGINE HARNESS CONNECTOR

Use a socket such as the Snap-On(R) YA8875 or equivalent to remove the sensor. See Fig 2.

Fig 2: Downstream 2/1 O2 Sensor
Courtesy of DAIMLERCHRYSLER CORP.
When the sensor is removed, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If using the original sensor, coat the threads with Loctite 771-64 anti-seize compound or equivalent.