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How to Replace Downstream O2 Sensor 00-07 Toyota Highlander

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  1. step : Removing the Oxygen (O2) Sensor (0:22)
    • Raise and support the vehicle
    • Disconnect the O2 sensor electrical connector
    • Unclip the O2 sensor wiring harness from the bracket with needle nose pliers
    • Unclip the O2 sensor wiring harness from the frame with trim tools
    • Loosen the O2 sensor from the exhaust with a 22mm wrench
    • Remove the O2 sensor from the exhaust
  2. step : Installing the O2 Sensor (2:15)
    • Apply anti-seize to the O2 sensor threads
    • Thread the O2 sensor into the exhaust
    • Tighten the O2 sensor with a 22mm wrench
    • Clip the wiring harness to the frame
    • Clip the wiring harness to the bracket
    • Connect the O2 sensor electrical connector

Hi. I'm Mike from 1AAuto. We've been selling auto parts for over 30 years!

You need to raise and support your vehicle. The downstream O2 sensor is located here. The wire goes up and over, hooks to this bracket and then plugs into the connector here. To remove it, start at the connector. Push in on the lock. Actually pull out this way.

You need to unclip it from here. This bracket's thin sheet metal, so I'm actually going to bend it down so I have better access to get to the clip and it's got some tabs and I'll push them in. We'll use needle nose pliers. I'll pull it out just like that. So what I did was I pushed these tabs in to unlock it and I’ll do the same to this one here. Pull that right out.

These are up inside the body, you can't get to them with the pliers so I'm going to use a clip prying tool and I'm looking at, so the clips are probably this way, the same. I'm going to try to go in from this direction and push them in. I'll pry underneath it. Pull it out. It might bend them a little bit, that's okay. Do the same for this one. Just like that. Okay.

Now the harness is loose I can get to this easily so I'm going to use a 22 millimeter open ended wrench. Start over there, break it free. Take the O2 sensor right out.

This O2 sensor's in good shape. It looks pretty new. We're going to reuse it. We just wanted to show you how to remove it. We're going to put a little bit of copper anti-seize right on the threads. Don't get any on the sensor, just enough on the threads. You don't have to go overboard with it. That should be just enough.

Thread it into the exhaust. Get that seated down. Take your 22 millimeter wrench. I'll tighten it. You don't want to over tighten them, just enough to squash the washer on there that seals it. It's just getting tight. I’m going to go a quarter turn more. Perfect. Plug the harness back into the spots that it came out of, just like that. This went underneath. This slid a little bit. There we go.

Stick it right in. Plug it back into the body harness. I'll push this bracket back up. The O2 sensor is replaced.

Thanks for watching. Visit us at for quality auto parts, fast and free shipping, and the best customer service in the industry.

Tools needed for replacement:

    Materials, Fluids, and Supplies

  • Anti-Seize Grease

  • Pliers, Cutters & misc Wrenches

  • Needle nose pliers

  • Specialty Tools

  • Trim Tool Set

  • Wrenches - Metric

  • 22mm Wrench

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