★★★★★
February 22, 2026
Fixed with no issues
Fixed my check engine light and got a fraction of the cost then what oreillys wanted to charge me. Easy install and no issues.
Replaces
Part Details
Specifications
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
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?
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.
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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.
OSA61248
Fixed my check engine light and got a fraction of the cost then what oreillys wanted to charge me. Easy install and no issues.
It did make my check engine light go off, but this O2's wire was several inches longer than my original wire. I had to find a way to roll it up, and tie wrap it to keep it from getting into something. I did not like that it did not match.
I recently purchased a Bank 2 O2 Oxygen Sensor from 1A Auto, and my experience has been exceptionally positive. Right from the start, I was impressed with the quality of the product. It was a perfect fit for my vehicle and has significantly enhanced its performance. Since installing the new sensor, I've noticed improved fuel efficiency and smoother engine operations. One of the standout features of 1A Auto is their competitive pricing. The Bank 2 O2 Oxygen Sensor was very reasonably priced compared to other vendors, allowing me to tackle my vehicle's issue affordably. This remarkable value for money, combined with the top-notch quality of the parts, makes 1A Auto my preferred choice for automotive components. What truly sets 1A Auto apart is their outstanding customer support, particularly through their instructional videos. The step-by-step guides provided for installing the O2 Oxygen Sensor were clear, detailed, and incredibly easy to follow. These videos made the installation proc
The O2 sensor replacement went smooth with this part and the code has not come back on. The part also came with the anti-seize lubricant applied, which was helpful!
Perfect fit, quick to ship, and best price. What more could I ask for.
have to buy two. same review for the other one.
Still getting the O2 DTC after replacing both sensors with TRQ parts. Wish I would have spent the few extra bucks for the OEM. No heat shields or clips on the TRQ. Part is probably okay, I just have a new/different problem now. 1A is a good company.
I did not use this product but requested a return. A1 was very responsive in helping me with my return. I am waiting for an email to finalize the process. This company is first class in support as well as products thus far. I will continue to use this company for my automobiles. No fault to the product or the company I decided to not install the item. it was my decision because I thought it was too difficult for me. This did not stop the company from granting my return and refund.
Doesn't work. Car runs worse with this then the old one. Tried to do a return but I will not let me. Unfortunately waisted my money
quality part! arrived pretty quick. love this website will never go anywhere else
Hello, this is listed for the downstream only.
The length was generous compared to OEM on a 2007 Impreza, but nothing a zip tie couldnt handle. If youre looking for a truly extended wire, it is probably best to look at a different option.
Zach, thank you for your inquiry! This sensor would not work as an upstream on your application. In order to see if we offer the correct upstream sensor could you provide your 17-digit VIN? We look forward to hearing back from you!
Yes, according to the information you provided, this will replace both the up and downstream sensors for a 2004 Subara Impreza 2.0L Turbo. Please let us know if you have any other questions!
Hello and thank you for your inquiry! We'd be happy to look into this for you, but will need the year, make, model and engine size of your vehicle to determine if this is correct for the upstream or downstream position for your application. We look forward to hearing from you. Thank you!
7/8
