Replaces
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Part Details
TRQ oxygen sensors are manufactured to precise specifications using premium raw materials to optimize your vehicle’s emission system. Each sensor is isostatically-pressed for improved strength and durability, and plasma-sprayed to improve sensitivity and prolong the service life of the sensors. Oxygen sensors wear out over time and should be replaced every 60,000 miles to prevent poor engine performance. TRQ recommends replacing the oxygen sensors in sets to optimize fuel economy and reduce overall emissions. All products are fit and road-tested in our Massachusetts R&D facility to ensure we deliver on our promise of Trusted Reliable Quality.
Product Features
What is Upstream vs. Downstream?
Install Tip: You may be required to reset the vehicle computer after installation of this part.
Item Condition:
New
Attention California Customers:
WARNING: This product can expose you to chemicals including Lead and Lead Compounds, which are known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Lifetime Warranty
This item is backed by our limited lifetime warranty. In the event that this item should fail due to manufacturing defects during intended use, we will replace the part free of charge. This warranty covers the cost of the part only.
Returns: Parts with electrical components cannot be returned once installed.
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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.
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Okay, friends. It's time to get started on our downstream O2 sensor. You're gonna find that located on your vehicle's exhaust. On this particular vehicle, it's right inside the catalytic converter. I'm gonna be doing the one on the driver's side, but the passenger's side would be approximately the same. One of the first things I like to do is disconnect the wiring. You can take a small pocket screwdriver or even just your finger, push on this tab, and then separate the two pieces.
I always like to take a peek at my connectors on both sides just to make sure I don't see any funny colors. I know I'm replacing the O2 sensor, but if I see some corrosion on this side, more than likely, there's some on the other side. At this point, I'm gonna remove the O2 sensor from the catalytic converter. You're gonna need a special tool for that, and it looks like this right here. You can see that it has a slot, and it's gonna fit right over the wire for your O2 sensor. Fits right on the O2 sensor, and try to break it free. There we are. Okay. There's our O2 sensor, friends.
Okay, friends. Now, it's gonna be time to get our brand new downstream O2 sensor in here. You're gonna notice on the threads that you have a little bit of Never-Seez. Leave it on there, but be careful not to get in on the sensing agent. We're gonna start this in by hand, and then, once it bottoms out by hand, we'll go ahead and snug it up with our tool. So now, we're just gonna go ahead and snug this up. I have it so it's bottomed out. We're just gonna go a teeny bit more because we wanna make sure that we crush down that gasket. That's nice and tight right there.
Next, of course, you wanna connect in the O2 sensor to the harness. Push that right in. Make sure it's locked. Give it a nice tug. If you have any excess cable, make sure that you just, kinda, tie this up so it's gonna be nice and secure. I'm gonna use a wire tie. Okay, friends. So, you finished your O2 sensor. Great job. Now, what you need to do is if you had a check engine light on, clear that code. Take your vehicle for a road test. If your check engine light stays off, you did great.
