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

Disconnect the negative battery cable.
Raise and support the vehicle.
Disconnect the electrical connector (Fig 1).

Fig 1: Removing Downstream Oxygen Sensor (1/2)
Courtesy of DAIMLERCHRYSLER CORP.
Use a socket such as the Snap-On® YA8875 or equivalent to remove the sensor (Fig 2).

Fig 2: Removing 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.