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
Application Specific Design: No modifications and pre-calibrated
Isotatic-pressed and plasma-sprayed for extended service life
Double-Layered 310S Stainless Steel: Additional protection from moisture and debris
Restored Engine Performance: Improved fuel economy and lower emissions
What is Upstream vs. Downstream?
Upstream location is between the catalytic converter and the engine
Downstream location is between the catalytic converter and the tailpipe
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.
FREE Shipping is standard on Orders shipped to the lower 48 States (Contiguous United States). Standard shipping charges apply to Hawaii, Alaska and US Territories. Shipping is not available to Canada.
Expedited is available on checkout to the United States, excluding Alaska, Hawaii and US Territories as well as P.O. Boxes and APO/FPO/DPO addresses. Final shipping costs are available at checkout.
O2 Sensors is it Upstream or Downstream
How to Replace O2 Oxygen Sensor 2006-10 Pontiac G6
How To Replace O2 Sensor 2007-13 Chevy Silverado
Created on:
Tools used
No Tools Needed
1. Identifying your Oxygen Sensors
Upstream oxygen sensors are located in between the engine and the catalytic converter
Downstream oxygen sensors are located in the catalytic converter or farther away from the engine than the catalytic converter
Locate your vehicle's firing order diagram
The bank that contains cylinder one is bank one
The bank that does not contain cylinder one is bank two, even if it does not contain cylinder two
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.
Tools used
O2 Sensor Socket
Ratchet
Swivel
1. Removing the Oxygen (O2) Sensor
Unclip the O2 sensor wiring harness from its bracket
Disconnect the oxygen sensor wiring harness
Remove the O2 sensor with an O2 sensor socket and a ratchet
2. Installing the New O2 Sensor
Twist the new O2 sensor into place
Tighten the O2 sensor with an O2 sensor socket and a ratchet
Connect the O2 sensor wiring harness
Clip the O2 sensor wiring harness into its bracket
Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet.
Hi, I'm Don 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 replace the upstream oxygen sensor. Now that's the one that's before the catalytic converter. It's between the motor and the catalytic converter. This is a 2007 G6 with the 4 cylinder motor, same as any G6 or Saturn Aura. The only tool you'll need is a 7/8 inch, oxygen sensor socket and a flexible headed ratchet will make the job easier.
Access your upstream oxygen sensor. It's right in behind the engine. This is a 2.4 liter, 4 cylinder. There's the oxygen sensor. There's the electrical connector. Now back in, there's a blue, little safety lanyard that you need to pull out. Then, there's just a tab on top of the connector, pull it up with your thumb and then you should be able to pull the connector right off. Now grab the other end, the end that's connected to the O2 sensor and pull it out of the clip. This is the tool that makes all the difference. It's an O2 socket. See it has a big slot in it that allows the electrical connector to go out to the side and then you put the socket around the oxygen sensor. A flexible headed ratchet like this is going to be your best bet, allows you to get the most leverage. Once you get the ratchet on there, turn the O2 sensor out and actually, this one comes out fairly easily once we get it started.
The new sensor goes in, just opposite of how the old one came out. Put it in place, get it in the hole and you can usually start it in by hand. Then, once you get it fairly tightened up, then make it nice and tight with the socket. Now, obviously, we need to reconnect the oxygen sensor. I'm just going a little fast, here, because doing it with one hand, makes it a little more difficult, but reconnect the connector. Make sure you put that locking clip back into place. Then clip the connector back into the bracket.
We hope this video helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.
Tools used
A Piece of Pipe (for leverage)
Flat Blade Screwdriver
O2 Sensor Socket
Ratchet
1. Removing the Oxygen (O2) Sensor
Raise and secure the vehicle
Remove the O2 sensor with an O2 sensor socket and a ratchet
Remove the rest of the sensor by hand
Disconnect the oxygen sensor wiring harness
Disconnect the clip to remove the sensor wire
2. Installing the New O2 Sensor
Twist the new O2 sensor into place
Tighten the O2 sensor with an O2 sensor socket and a ratchet
Connect the clip to the sensor wire
Connect the O2 sensor wiring harness
Lower the vehicle to the ground
Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet.
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 show you how to replace an O2 sensor on this 2011 Chevy Silverado 1500. It's the same part and a similar process on a large variety of GM models. The items you'll need is a new O2 sensor from 1AAuto.com, flat blade screwdriver, specialized 7/8 inch socket specialized for O2 sensors, ratchet, and possibly a piece of pipe for leverage.
We have the vehicle lifted. You don't actually have to do this, we just do this to make it easier to show you. Right here is your downstream O2 sensor, your catalytic converter, and your upstream O2 sensor. On the other side same thing: downstream, catalytic converter, and the upstream.
We're going to show you how to replace one of the upstream O2 sensor. Here's the 7/8 inch socket wrench, and you could use a 7/8 wrench but we recommend the socket. It will make it a lot easier.
Slide that special socket on there, attach a ratchet, and a piece of pipe for extra leverage. Once you break it free you can loosen it the rest of the way and remove it by hand. If you follow the harness from the O2 sensor you'll end up here. This will be a little bit hard to show some of this because there's not a lot of space to work there. Pry off the clip that holds this to the harness. You see that's freed.
Now, what you want to do is use a pair of pliers. You can also use your hands or a screwdriver. Pull that green pin out and then disconnect the harness. There's actually a little black clip that connects the harness. Pull that out of there. You may need a flat blade to help you pry it out.
Here's the new part up front, the old part in the back. You can see they're identical. The exact same part, all the same mounting points and everything. Feed your new O2 sensor up into place and twist it in. Fast-forward as he tightens that up. He does this at a slightly different order, but it's the same set of clips.
You want to first reconnect that wire to that harness there with that large clip. Take that little black clip and slide it into place on that bracket. Reconnect the harness and slide that green pin back into place. You're all set.
We hope this video helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.
OSA61640
In Stock
Product Reviews
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4.89/ 5.045
45 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
43
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1
Very happy
J
September 12, 2018
I never ordered anything from 1a auto before this and now Ill never order anything from anywhere else but 1a auto
Amazing purchase and easy install
Ricardo
September 13, 2018
I like their quality and their fast shipping at a low cost very great service they gave me and the parts are exactly what I was looking for and I installed them as soon as they were delivered a few days after they shipped them and my truck works like new I will always buy parts from them they are great people with great service and amazing quality parts
O2 sensors same
kevin
May 13, 2019
So all the O2 sensors on the vehicle that I received are the same sensors down stream or upstream. Easy to install once you broke the old ones free and cleaned out the threads with a thread chaser (highly recommended). Came on time and was quick.
Worked
Matthew
June 12, 2019
Not sure what else to say about them, they worked.
Nice
Phillip
June 13, 2019
Works good got my check engine light off.
Works great on 2003 GMC Yukon XL
Darryl
July 14, 2019
Got check engine error for Bank 1 sensor so decided to replace all four. No errors so far @ week 3.
Goodbye Pesky Check Engine Light
Glenn
September 5, 2019
So far so good. These O2 Sersors were fairly easy to install and my check engine light has gone away.
O2 Sensors - 4 pc Set
Robert
November 3, 2019
Purchased for installation on my 2004 Chevy Avalanche. Sensors fit perfectly and wire lengths exactly as those installed. Sensors were individually boxed and sealed in plastic/mylar bags. Drove the vehicle about 20 miles and checked sensor readings with an OBD-II scanner. All readings satisfactory. Shipping was fast. Will definitely consider 1A-Auto for future purchases.
Rob in CT
1a auto never disappoints
J
November 13, 2019
As always when Ive ordered from 1a Ive received the correct item in a timely manner. I recommend 1a to everyone I know when they are ordering parts online.
O2 Sensor set
Tyler
January 15, 2020
I only ordered the part after my husband told me what my baby needed. The parts arrived just as planned. They were a perfect fit and other than having huge forearms making it difficult to reach, they were a breeze to install per my husband. We love 1AAuto!
2005 chevy O2 sensors
Craig
February 13, 2020
These were delivered promptly. The price is half what you would pay at an auto store. They worked as expected. It helped with fuel economy and check engine light is now off.
Perfect fit, right parts
jamaar
March 8, 2020
My mechanic put my hubs and 02 sensors on with no problems at all. Will continue to shop here for sure
O2 Sensors - perfect fit.
Eric
May 3, 2020
The O2 sensors are a perfect fit and solved the issue. Check Engine light turned off in less than 10 cycles. Fast delivery, easy to install.
O2 Sensors for a 2004 yukon xl
D
August 27, 2020
I would definitely recommend this product. Fast delivery & easy to install.
Looked and worked as good as OEM
Kameron
September 20, 2020
I previously bought sensors off of Amazon to replace my oem O2 sensors and they went out after a few days. These were the same quality as oem and Ive had them on for a month with zero issues.
All (4) 02 sensors for a 2005 Tahoe
Tony
September 21, 2020
The sensors came fast. And already had anti-seize on the threads.
Clear the check engine light and it has not came back on Tahoe seems to run smoother.
Watch the video they provided which was great help.
4 oxygen sensors
Joseph
October 19, 2020
The parts were perfect, great price, free shipping.
Part that was the issue was a bad fuel pump.
Returned 4 oxygen sensors and received refund.
Thank you, 1A auto.
Joseph Coates
O2 install
Gary
November 8, 2020
three of the four installed fine. Fourth one on upstream passenger side could not remove old one. Will have to take to the shop to see if they can remove it and install part. Seem to be running a little smoother even with just three new ones installed. Hopefully this will clear all end it is not the fuel pump.
02 sensors
T
April 10, 2021
Quality parts for an affordable price. I would recommend buying product from this Supplier.
Mrs.Mechanic
F
April 13, 2021
I love shopping with A1 it's easy to browse and they carry everything! Currently updating my 03 Chevy Tahoe and its been awesome from the prices to the quick delivery. A1 has my vote and recommendation. The vidsssszzz... Kills it! Thats how I put these O2's on and light is off, baby feels great!
Thank you A1
Excellent accurate service
Aaron
May 14, 2021
Nothing more to say, exceptional.
Paul
June 21, 2021
I was very satisfied with my purchase. All the items fit perfect and installation was easier than I expected. Would highly recommend to anyone. Have been ordering through 1A FOR OVER 5 YEARS NOW.
One failed within 300 miles of install
Marc
August 8, 2021
One of the four oxygen sensors failed within 300 miles. Was 200 miles from home when it happened and was charged $60 for another sensor at Napa auto parts and $120 by a shop to install since I had no access to tools or a jack to install myself.
That sucked.
perfect on my car and the price awesome ??
susan
December 12, 2021
Perfect product thank you five stars
JUSTIN
February 8, 2022
I called to ask about the warranty on my o2 sensors and prompts were easy to follow plus ill have a new sensor in about 7-10 days
Allin
March 12, 2022
Fit perfectly and no problems
Will recommend
Alberto
March 30, 2022
Perfect changed all 4 sensor's check engine light went off and truck is running great
Ernest
April 3, 2022
I am a diy guy.
Thank you guys for asking for feedback.
They came in foil packing inside Individual boxing and they were a direct fit. thank you guys so much for the fast delivery service!!
Too good to be true? The price? Warranty? It's real. It's true. Replace those old 02 sensors today.
Lyle
July 7, 2022
They are very well made. Already has anti seize on the threads. Has been working like Champs in my 5.3 Tahoe!
HUMBERTO
August 8, 2022
Worked great
Danny
November 30, 2022
Always good products....
O2 Sensors
Gary
February 7, 2023
Perfect replacement - solved the problem.
Good quality part at a reasonable price, and quick shipping.
Michael
February 7, 2023
On my 2004 Chevy Silverado, 1500, 04 upstream and downstream sensors are the same. Good quality part, working well so far at a fraction of the price of dealers. Pay attention, take your time and you'll be amazed how easy it is to replace these. Always wear eye protection under the vehicles. You wouldn't believe the crud that fell off while I was changing these. Glad that it didn't hit my eyes.
really good price and quality parts for my chevy
Darrell
March 23, 2023
quality parts for my 5.3 so far so good. great price too. thanks again from texas.
stephen
March 23, 2023
I have an 04 silverado and had these put on and everything smoothed out. They work great!
Great product
Justin
April 2, 2023
Great product exactly what I needed to smog my 2005 GMCSLT sierra pick up.
Quality product
James
May 29, 2023
Fixed the rough engine idle and fuel consumption issues. Make sure to put anti seize on the threads just in case. Warning the passenger front is a little bit of a pain to get out, I had to cute the cable off the old one just to get it to fully spin.
P0300 fix for my 03 Chevy avalanche
Paul
September 25, 2023
Was hesitant at first to buy non O E M parts. But after receiving the 4 piece 02 sensors kit and the 8 pc TRQ spark plugs for my 2003 Chevy avalanche, she now runs great, no p0300 codes have been thrown, no rough idle, no misfires. A great big thank you to 1A Auto. I would highly recommend these parts.
Keith
October 9, 2023
Great deal fit great
Above and beyond service!!!
Marc
January 24, 2024
Thank you for everything, I bought the O2 sensors and installed them myself thanks to your video it was a big help and truck is running great now ????????????
03 silverado 1500
Miguel
May 10, 2024
All 4 O2 sensor worked and fit on my 2003 silverado 1500 5.3.
Highly recommend
TRQ O2 sensor kit
Edward
May 16, 2024
Turned my engine light off for the first time in 10 years. I Drove about 500 miles so far and working perfectly.
Travis
September 18, 2024
Worked great
Nick
September 28, 2024
Parts showed up well before they said they'd be here and now my Yukon runs better than ever. Took 10 minutes to change all 4
Patrick
November 5, 2024
These were a pain to replace, but work just like OEM.
Customer Q&A
Do you ship to Canada?September 23, 2018
S I
10
Hello! We do ship to Canada, and all shipping charges will be calculated and displayed upon check out.
September 24, 2018
Peter L
Are these oem parts. A friend bought bouch sensors. An his code kept tripn. Mechanic told him that it must b a oem part inorder to keelp code from tripin. Is this true?.March 30, 2019
Travis R
10
Our parts will be OEM replacements so you would not have to pay for the dealer price tag.
March 30, 2019
Corey M
Anyone use these on a 2005 Yukon 5.3l?August 20, 2019
B N
10
Yea theyre good and work no issues ! Youll be glad you bought em from here, trust me
August 20, 2019
J U
10
Be sure to check out the Product Reviews on the listing as well! You can find this at the bottom of the page. Please let us know if you have any questions and we'll be happy to help as well.
August 20, 2019
Peter L
10
Yes! I installed them myself after watching a YouTube video of an A1 mechanic installing the oxygen sensors. My GMC passed smog and is doing swimmingly!
August 21, 2019
Justin R
10
No it was a 2005 Suburban
August 22, 2019
Cleveland D
Will this work for a 2005 Chevy Silverado 1500, 6.0?September 18, 2019
J E
10
Yes they will fit Chevy Silvardo
September 18, 2019
C H
10
Thank you for the inquiry. These will not be compatible with your 6.0, these are specifically for the 5.3.
September 19, 2019
Curtis L
Does it matter up stream down stream are they all the same on 2005 chevy silverado I bought a set and they were all the same ones?April 4, 2020
Rick S
10
Theyre all the same, i had one go bad, but i just changed them all out. No specific order, 05 Tahoe 5.3
April 4, 2020
D A
10
In my 2003 Suburban they were exactly the same. Up stream and down stream refers to in front of the cadilletic converter and behind the cadilletic converter. The sensors perform the same job , monitoring efficiency of the converter. These signals are sent to the onboard computer.
April 4, 2020
MATTHEW S
10
it does not matter all the same
April 4, 2020
S A
10
No . You can use the same oxygen sensors on bank one and on bank two.. They are all the same.
Good luck!
Justin
April 4, 2020
Justin R
10
Hey Rick,
These sensors for the 5.3L will fit the upstream and downstream locations and doesn't matter what bank/side they go on. If you have any questions feel free to contact us and have a great day!
Thank you,
Corey
April 4, 2020
Corey M
10
Yes, they are all the same sensor
April 4, 2020
Daren D
Will these fit my 2004 suburban 1500 z71 flex fuel?August 31, 2020
Chad C
10
Yes, according to the information you provided, this part will fit your vehicle. Please let us know if you have any other questions!
August 31, 2020
Corey M
Will these sensors also work on a 4.8 v8?October 7, 2020
David M
10
This part will not fit your vehicle. We may have a part that is listed to fit.
Please enter your vehicle's year make and model in the search bar at the top of the page. This will display parts for your vehicle. From here, check off the correct engine size on the left hand side. This will narrow down the parts specifically for your engine size.
October 7, 2020
Christa R
Will these fit on 2004 Silverado 4.3L V6?June 14, 2021
David S
10
Currently, we do not carry this part for your vehicle. We're always updating our inventory so please check back soon!
June 14, 2021
Emma F
I have a Chevy Tahoe 2003 LT 5.3 engine I need for O2 sensors which one you recommend ?May 17, 2022
MICHAEL H
10
Yes, this part will fit your vehicle.
May 17, 2022
Emma F
Is this part the same for US and Canadian GMC 5.3s ?..March 23, 2023
Kevin B
10
Yes, this part will fit your vehicle.
March 23, 2023
Ricale A
Will this fit a 06 Chevy Silverado 1500 5.3?March 12, 2024
Josh E
10
Currently, we do not carry this part for your vehicle. We're always updating our inventory so please check back soon!
March 12, 2024
Emma F
Are the o2 mark upstream and downstream?November 9, 2024
Pedro S
10
Yes they are...hope this helps
November 9, 2024
Craig R
10
both
November 9, 2024
Stephen M
10
Both
November 10, 2024
Gary S
Customer service
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