About TRQ: TRQ is a trusted brand dedicated to making every repair a success story by combining premium parts with easy installation. Each TRQ part is engineered by a team of automotive experts to meet or exceed OEM standards, delivering enhanced performance and maximum longevity. With rigorous in-house testing, the brand ensures superior fit and function across every product line. TRQ also provides customers with best-in-class, step-by-step installation videos—so you can complete repairs with confidence, whether you're a first-time DIYer or an industry professional.
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
Description
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.
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.
Returns: Parts with electrical components cannot be returned once installed.
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.
Is my Car a California or Federal Emissions Vehicle
O2 Sensors is it Upstream or Downstream
Created on:
Tools used
No Tools Needed
1. Determining Your Emissions Specification
Open your hood
Locate your catalyst sticker
If the sticker says "This vehicle conforms to California regulations," you have a California emissions vehicle
If the sticker says "This vehicle conforms to US EPA regulations," you have a federal emissions vehicle
If the sticker lists both EPA and California regulations, you have a California emissions vehicle
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.
Determining whether or not your vehicle is a California emissions or a federal emissions vehicle is pretty straightforward. To do this, you'll want to locate your catalyst sticker under the hood of your vehicle. It'll either be actually on the bottom side of the hood, most GM vehicles have it on the air box, and other vehicles may have it along your radiator support at the front of the engine bay.
All you need to do is see, "This vehicle conforms to California regulations." That means that this vehicle is a California emissions car. Just because you're not in California or are in California doesn't necessarily mean your vehicle will be one way or the other.
Now, our F150 has it down here on the radiator's support, right at the front of the engine bay and you can see here, "This vehicle conforms to US EPA regulations." This means that this vehicle is a federal emissions.
Now, here we have two things that are a little different. Our catalyst is located on the vehicle's air box and this vehicle conforms to US EPA regulations and California regulations. If it conforms to both federal and California emissions, it's considered a California emissions vehicle.
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
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.
OSA61295
In Stock
Product Reviews
4.3/ 5
★★★★★
38 reviews
5★
26
4★
6
3★
1
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0
1★
5
★★★★★January 3, 2026
Works as it should
TRQ products I have bought in the past always installed and pro formed with no issues and this O2 sensor is no exception. Installed, cleared code and have been driving the car for weeks with no issues whatsoever.
★★★★★March 7, 2025
Buen producto
Excelente marca y producto funcion a la perfeccin
★★★★★January 27, 2025
Satisfied
Has worked great, exact fit
★★★★★December 4, 2024
Arrived on time, good quality everything professional and great customer service thank you
★★★★★March 22, 2023
Everything was good thank you
★★★★★January 13, 2023
No joy O2 sen
It was defective. I wasted my time installing it and it didn't work.
★★★★★December 14, 2022
Direct Fit Replacement!
Excellent product, direct fit replacement! I purchased the new header/cat converter and bought the new O2 sensors just to have everything new. Simple bolt in, plug n play item!
★★★★★December 9, 2022
Quality looking sensor.
Very quality sensor. Nice silicone over wrap on wires. Nicely packaged with cap protecting sensor.
★★★★★November 3, 2022
PERFECT!
★★★★★April 2, 2022
Oxigen sensor upstream
Just working for lest the 1 year
Showing 1–10 of 38 reviews
Customer Q&A
Got a question about this part? Post it and get answers from our team.
JohnMarch 18, 2022
Is it heated?
Not exactly sure what you mean by heated but it worked perfectly fine. Easy to replace.
Charskra · March 19, 2022
JamesJanuary 7, 2022
How long is the wire harness? My 2006 Altima 2.5 upstream has 23"
Actual Measurements are not listed or available. Our parts are exact replacements for your vehicle's OEM parts. As long as your year, make, and model match up with our listing, these parts will directly fit and function like the originals.
T · January 7, 2022
ShawnAugust 22, 2021
2006 Nissan Sentra have bought model # 17179 and was wrong size would this be the correct one ? Base on pictures this still doesn't look like match size tip
This will work as the upstream sensor for the L4 1.8L or L4 2.5L on a 2006 Nissan Sentra
Cristina · August 23, 2021
JMay 1, 2021
What time is life time warranty for this brand of sensor,1 year or two or how many? Thanks
This part has a Limited Liftetime Warranty. It covers manufacturing defects and premature wear of the part.
Andra · May 3, 2021
AJuly 1, 2020
If I buy this item and it is damaged in a couple of months, what would happen?
Thank you for your question, Andres. This part is covered under our lifetime warranty, so if the item fails due to any manufacturing defects it is eligible for a replacement. If you have any other questions regarding the warranty check out this link: <a href="https://www.1aauto.com/customer_service/support_faq#refunds" target="_blank">https://www.1aauto.com/customer_service/support_faq#refunds</a>
T · July 1, 2020
JuanSeptember 26, 2019
Is this 02 sensor an upstream or downstream?
Thank you for the inquiry. This will be an upstream oxygen sensor.
curtis · September 27, 2019
ZAugust 7, 2019
Is this sensor for bank 1 or 2?
It will depend on your vehicle. This is going to be a rectangular plug and if your plug is a square then it will be incorrect. We will need more vehicle information to verify this. You can certainly contact us at 888-844-3394 and we can verify this for you.
Corey · August 13, 2019
LeonardMay 20, 2019
Is this for Bank 2 sensor 1?
This will fit both upstream banks for your vehicle!
T · May 22, 2019
MichelleJuly 31, 2018
Is this any actual brand? I see the more expensive one is a Walker but what brand is this sensor?
We have a few different aftermarket companies build these parts specifically for us, as our 1A Auto house brand. They are manufactured to the same OEM specifications as the original part that came with your vehicle. If you have any further questions, please don't hesitate to ask.
T · August 1, 2018
MonteMay 14, 2018
Is this for California emissions or federal?
County emissions
James · June 20, 2020
Showing 1–10 of 10 questions
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