Upstream O2S Sensors

WARNING: This page is about a different car, the 2012 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

Raise and support the vehicle.
WARNING:
The exhaust pipes and catalytic converter become very hot during engine operation. Allow the engine to cool before removing the oxygen sensor.

CAUTION:
When disconnecting the oxygen sensor electrical connector, do not pull directly on the wire going into the sensor. The sensor wiring can be damaged resulting in sensor failure.
Disconnect the O2S sensors (1, 2) electrical connectors.
Remove the left catalytic converter heat shield.
Using the appropriate oxygen sensor removal/installation tool, remove the O2S sensors.
Clean the threads in the exhaust pipes using an appropriate tap.