How to change an O2 sensor

New Denso o2 sensor
New Denso o2 sensor

These are the tools I used
These are the tools I used
Locate the bad o2 sensor and follow the wire
Locate the bad o2 sensor and follow the wire
Carefully disconnect the sensor
Carefully disconnect the sensor
Loosen the o2 with the socket
Loosen the o2 with the socket
Carefully unscrew the o2 by hand - watch the wire!
Carefully unscrew the o2 by hand – watch the wire!
New vs old o2 sensors
New vs old o2 sensors
Apply an even coat of anti-seize
Apply an even coat of anti-seize
An even coat on the threads only!
An even coat on the threads only!
Then hand tighten, watching the wire, use the socket to torque it a little, and connect the wire to the harness.
Then hand tighten, watching the wire, use the socket to torque it a little, and connect the wire to the harness.

After all this is done, its a good idea to reset the car computer (by pulling the fuse or disconnecting the battery for 10 minutes – watch out if you do not have your radio code, etc) – be sure to consult your repair manual for exact specifications! Some cars may need an obd reset, or something else.