How to Replace Downstream O2 Sensor 7-13 Nissan Altima
Difficulty: Intermediate · About 30 min · Nissan Altima
Replace the downstream oxygen sensor on a 2007–2013 Nissan Altima by disconnecting the sensor harness and threading the replacement into the exhaust bung.
Tools you will need
- Oxygen-sensor socket or 7/8-inch wrench
- Pliers
- Pick tool
Parts and supplies
- Direct-fit downstream oxygen sensor
Steps
Locate and disconnect the sensor
Allow the exhaust to cool completely and identify the downstream sensor after the catalytic converter. Release its connector lock and unplug it without pulling on the harness wires.
Remove the old sensor
Free the wiring clips and use an oxygen-sensor socket or suitable wrench to loosen the sensor. Keep the harness from winding around the sensor as it turns.
Install the replacement sensor
Verify the new sensor matches the connector and thread. Start it by hand in the exhaust bung, then tighten to the vehicle specification while keeping the wire clear of the hot pipe.
Reconnect and inspect
Reconnect the harness until its lock engages and restore the wire clips. After the exhaust cools, lower the vehicle if raised and check operation with a scan tool or warning-light check.
Check your vehicle’s repair manual for exact specifications and fit.