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.
Quality Tested - built to a strict level of product standards.
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. I hope this how-to video helps you out, and next time you need parts for your vehicle, think of 1AAuto.com. Thanks.
In this video, we're going to show you how to replace the rear or downstream oxygen sensor on this 2006 Chevy Impala. You'll either need a 7/8 inch oxygen sensor socket with a ratchet or breaker bar, or a 7/8 inch wrench. You'll also need a pair of pliers, jack and jack stands, and a new oxygen sensor from 1AAuto.com.
The downstream or rear oxygen sensor and harness, there, are located downstream of the catalytic converter. You can use a 7/8 inch wrench or that special O2 sensor socket that you see here. I'm using a pipe to get extra leverage. I try and break it free first with this, and if that doesn't work then I'm going to go ahead with the wrench. You can see here that I'm applying some pressure and it's just too tight. Maybe there's a little bit of corrosion between the O2 sensor and the exhaust. Before I damage the nut there, I'm going to go ahead and switch over to a traditional wrench. Now that I've broken it free, I'll go ahead and fast forward as I finish unscrewing that. Underneath the protective flashing there you'll find the connector. You'll need to first remove the little white tab that goes through the connector, so that you can then unclip it. It can be kind of tricky. You might need some needle-nose pliers to press that in. Then give it a good tug, but once you get that white little tab out, you'll be able to disconnect the connector. It won't hurt if you pull it down a little bit more, to get a little bit more room. Then lift up on the tab and disconnect the O2 sensor.
Going back in, make sure that you thread in and tighten up the oxygen sensor before you plug it in or you'll get your harness all twisted up. I'm going to use my 7/8 inch wrench again to go ahead and do that. Once I've done that I will clip in the connector there to the harness and put my little white tab back through that connector so it doesn't come loose, and then, press the protective flashing back up against the bottom of the chassis.
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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.
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