How to Replace Downstream O2 Sensor 00-07 Toyota Highlander
Difficulty: Intermediate · About 40 min · Toyota Highlander
Replace the downstream oxygen sensor on a 2000–2007 Toyota Highlander by supporting the vehicle, routing the harness through its retainers, and tightening the sensor to specification.
Tools you will need
- Floor jack
- Jack stands
- 22mm wrench
- Needle nose pliers
- Trim tool
Parts and supplies
- Downstream oxygen sensor
Steps
- Raise and support the vehicle
Park on a level surface and lift the vehicle at approved points. Support it securely on jack stands before accessing the exhaust; never rely on a jack alone.
- Disconnect and remove the sensor
Unplug the sensor connector and release the harness from its bracket and frame clips. Use a 22mm wrench to loosen the sensor and remove it from the exhaust bung.
- Install the replacement sensor
Apply anti-seize only if the sensor is not already coated and its instructions call for it. Thread the sensor in by hand, tighten to the vehicle's specification, and clip the harness back into its retainers.
- Reconnect and inspect wiring
Reconnect the electrical plug and confirm each wire clip is seated. Make sure the lead cannot touch the exhaust, then lower the vehicle and check for warning lights after startup.
Check your vehicle’s repair manual for exact specifications and fit.