1/1 Upstream - 2.0L/2.4L

WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Oxygen Sensor (1/1 Upstream & 1/2 Downstream)

Courtesy of DAIMLERCHRYSLER CORP.

1 - DOWN STREAM O2 SENSOR

2 - UP STREAM O2 SENSOR

After removing the sensor, the exhaust manifold 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.
Connect electrical connector to sensor (2).
Install the negative battery cable.
Install the air cleaner lid and makeup air hose.