2005 Dodge Neon L4 2.4L Downstream Bank 1 Sensor 2 O2 Oxygen Sensor DIY Solutions EMS00640

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In this video, we're going to show you how to replace an O2 Sensor on this 2006 Jeep Liberty with a 3.7 Liter V6 Engine, and both upstream and downstream O2 sensors are actually the same part and a similar process on this vehicle. We're just going to show you one of them. All you'll need for this are a new O2 sensor from 1AAuto.com, and a 7/8 inch O2 socket and ratchet or a 7/8 inch wrench.

Right here, is your bank 2 upstream O2 sensor, and here is your bank 2 downstream O2 sensor. On the other side, is your bank 1 upstream O2 sensor, and your bank 1 downstream O2 sensor, and this is the one we're going to show you the procedure on.

First, pull the harness free and then push on the tab on the connector and pull it free. For this particular O2 sensor you have a choice of which tool you can use. You can either use the O2 socket and a ratchet or you can use the 7/8 inch wrench. You really just loosen it with one of these tools and then you can remove it, the rest of the way by hand.

On the right, is the old O2 sensor. On the left, is the new one from 1 A Auto. You can see they're identical and will mount exactly the same. Twist your new O2 sensor into place and just tighten it up. Then re-clip your harness, and plug it back in. Now, you're all set.

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In this video I have a couple of oxygen sensors with me. While there are some aesthetic differences here, the wire lengths are a little different, the actual body and tip of the sensor are a little different, the threads and gasket are the same, and on the other end the connections are actually the same. I can plug these into either position on our vehicle. But if I had to ask you which one's upstream and which one's downstream, you probably can't tell just from looking at them. That's true of most oxygen sensors. The way you determine whether or not an O2 sensor is upstream or downstream is all done visually.

Your oxygen sensor position can be determined relative to your catalytic convertor. As the name suggests, upstream sensors will be located upstream or ahead of, in front of, above, closer to the engine than your catalytic convertors. This means that they see the exhaust gasses first. They then go through the catalytic convertor and to the downstream oxygen sensor, which will either be located in the catalytic convertor like our vehicle here, or after the catalytic convertor to monitor the gasses coming out of the cat and make sure that it's being efficient relative to the readings of the upstream O2 sensor.

The other determination you need to make is bank one versus bank two. Determining which bank is which can be done by looking at a picture of your vehicle's firing order. Whichever bank contains cylinder one is going to be bank one, and the other one, regardless of whether or not cylinder two is in it, is going to be bank two by default. These banks are true of V engines like V8s, V6s, and flat engines like Porsches and Subarus that have individual banks.

On inline four-cylinder engines, as long as they have one exhaust manifold like a Jeep four-liter or a four-cylinder Honda engine, you'll only have one bank with an upstream and downstream O2 sensor. There will be no bank two on the engine.

On our vehicle here, this is the passenger side, which we've already determined from the firing order is bank one. We have our upstream sensor here closest to the engine ahead of the cat. Then we have our downstream or sensor two here inside of the catalytic convertor. This could also be located somewhere after the cat. Here I have my two sensors for the vehicle. While they are aesthetically different, we can now tell this is my upstream sensor because it looks just like the upstream sensor I have up there. This is my downstream sensor. Now that we know which one's which, we can order the right part, correct the problem, and fix you up right.

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