How to Replace O2 Oxygen Sensor 1990-2010 Ford F-150 Truck

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Right here, on the driver's side of the truck right behind the catalytic converters you'll find an O2 sensor. This is the rear O2 sensor, also known as the downstream sensor, and it's pretty easy to disconnect on this truck, especially in this case because this truck actually has a brand-new catalytic converter pipe and it has relatively new O2 sensors. So we're going to show you how to replace them.

We're going to use a 22 millimeter wrench. You can come up from the front and get the wrench on their pretty easily, and then it's just a matter of pushing up to loosen the O2 sensor. Then, if you follow the wire up to the top of the transfer case, you can see it plugs in right here. And if you pull on, if you push the little tab down, right here, and then pull on the connector, it should slide right out. At that point, you can come right back around and spin your O2 sensor right out of the exhaust system, just like that. There we go.

When installing the O2 sensor, you always want to put the O2 sensor in first and tighten it up rather than plugging it in first, and that way it makes it so your wires don't get all bound up. So right now, you can spin it into the hole and make sure that the wires aren't getting all twisted up at the same time. Because if you twist the wires up, sometimes they'll actually get damaged and we don't want to do that. So, we'll use the same 22 millimeter wrench to tighten up the O2 sensor from the front just like when we loosened it.

All right. It's nice and tight now. And at this point we can feed the wire up over the transfer case and we can play it right into the wire harness, just like that.

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