2004 Chrysler Pacifica V6 3.5L Upstream O2 Oxygen Sensor TRQ OSA61203

Hi, I'm Mike from 1A Auto. We're dedicated to delivering quality auto parts, expert customer service, fast and free shipping, all backed by our 100% satisfaction guarantee. Visit us at 1AAuto.com, your trusted source for quality auto parts.

In this video, we're going to be working with our 2006 Chrysler 300 3.5 liter. We're going to show you how to remove and replace the rear or downstream O2 sensor. We replaced the one on the passenger side, however this process will be the same for the driver side, as well as for the 2.7 liter V6s. If you like this video, please click subscribe. We have a ton more information on this car as well as many other makes and models and if you need this part for your vehicle, you can follow the link down in the description over to 1AAuto.com. Here are the items you'll need for this repair.

The downstream or rear O2 sensor on your Chrysler 300 is located here, just behind this catalytic converter on the exhaust. Follow the sensor over, push down, and release the electrical connector. You can remove this O2 sensor with a 22 millimeter wrench. Now I find the best way to remove these, because they can be pretty stubborn is to do this when the exhaust is hot. Be careful not to touch the pipe. You may have to tap that wrench on there a little to get it to bite. Tapping the end can help shock that sensor loose, and make it a lot easier to remove. Once you've got it cracked loose remove it the rest of the way with your 22 millimeter wrench.

Here we have our old part that we removed from our vehicle, and our new part from 1AAuto.com. As you can see, these parts are exactly the same. We have a nice new harness on ours, a little bit longer wire to make sure that it fits this application without stretching that wire out and making it tight and damaging it. On the end, we have this little cap which keeps dirt and debris out of that during shipping, as well as keeps that anti-seize on the threads, which comes right from the factory. Meaning when we thread this in, it won't get locked in there should we ever have to remove it again.

What your downstream or rear O2 sensor does is reads the exhaust gases coming out of the backside of your catalytic converter. This ensures that the catalytic converter is processing those harmful emissions gasses properly, and sending a cleaner, acceptable emission out of the tailpipe. So if you have a check engine light for a bad rear O2 sensor, or if you have one for a bad catalytic converter, these can also give a false reading, making that catalytic converter appear to go bad. This new sensor from 1AAuto is going to go in direct fit, just like your original equipment, and fix you up right.

Install your new O2 sensor into the bung on the pipe, get those threads started. Make sure that you keep the pigtail for the wiring harness out of the way so it doesn't get stuck in there. Once you get it started, go ahead and tighten it back down until it seals with a 22 millimeter wrench. Reconnect the electrical connector.

If your vehicle had any codes, disconnect the negative side of the battery and allow it to sit for a few hours, or use a scan tool or local repair shop to clear that check engine light and you’re good to go.

Thanks for watching. Visit us at 1AAuto.com for quality auto parts, fast and free shipping, and the best customer service in the industry.

Hi, I'm Mike from 1A Auto. We've been selling auto parts for over 30 years. We're dedicated to delivering quality auto parts, expert customer service, fast and free shipping, all backed by our 100% satisfaction guarantee. Visit us at 1AAuto.com, your trusted source for quality auto parts.

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.

Thanks for watching. Visit us at 1AAuto.com for quality auto parts, fast and free shipping, and the best customer service in the industry.