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 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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O2 Sensors is it Upstream or Downstream
How to Replace Upstream Oxygen Sensor 2003-2007 Nissan Murano
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
OSA61641
In Stock
Product Reviews
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4.69/ 5.013
13 reviews
5 Stars
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Great Delivery Service
P
October 2, 2019
I ordered the parts and received them in 3 days. All parts were exactly what I needed.
Good Replacements
Samuel
February 24, 2020
So far so good. I replaced oem units for these about 100miles ago and the "check engine" light has not come back. The pigtails are a few inches longer than oem which was somewhat helpful. They certainly appear and feel like quality units.
I will change my rating if anything changes, but if you're reading this now they're still working great.
My car didnt react to the sensors...
Jean
March 11, 2020
My scanner revealed that only bank 2 was reading ... bank 1 was completely disfunctional.
O2 sensors
Michael
August 5, 2020
It was nice to finally deal with a good company that delivered on time and sent the correct parts. Thank you for the promptness and accuracy!
Titan parts
Michael
August 16, 2020
02 sensors. In stock, good price and helpful videos. Made things a little easier.
2005 Nissan Altima 02 Senor
C
November 7, 2020
I got the parts and tool in the time specified and was very happy with my purchase. Haven't had a chance to replace them yet because of health issues but plan on soon.
Very great parts
jose
November 13, 2020
Very reliable parts and half the price from any store anywhere near me for miles. You can always rely on 1A Auto for the best parrs and most affordable prices
Very fast service..excellent quality products
James
December 4, 2020
I will definitely purchase my auto parts from here and refer my friends and family..keep up the great work
Check engine
B
December 29, 2020
Works great took my check engine light off and that's what I wanted...
02 sensors are specific problem child, especially in Toyota and Nissan
Rick
May 19, 2021
Great product wen getting 02 sensors always go with Bosch or ac Delco or if ya can afford it denso. Especially in Toyota and Nissan cars. A1 has never let me down great product s excellent service
Was right parts delivered fast
Joshua
May 21, 2021
I have never had a issue with A 1 always right parts good prices and they always show up before you expect them to definitely my go to site for parts on all 7 of our vehicles
vincente
January 25, 2022
Good
James
November 7, 2022
Excellent
Customer Q&A
Are these direct fit?August 13, 2019
Jeff S
10
Thanks for your inquiry. This part is specific to vehicles with a particular set of options. We will need more information about your vehicle to confirm the fit.
The information we will need in order to assist you is your VIN.
August 14, 2019
Emma F
How many inches long air sensors?September 19, 2019
Alberta J
10
Thank you for your inquiry. 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. Please let us know if you have any other questions. Thank you!.
September 19, 2019
Christa R
Why does my 2006 nissan pathfinder cut off while driving ?November 11, 2019
Cynthia M
10
Thanks for your inquiry. There could be multiple reasons why you're having this particular problem. We suggest taking your vehicle to a nearby reputable shop to identify the cause. Once you know the cause, we'll be happy to see if we carry the parts and how-to videos needed for your repair.
November 11, 2019
Emma F
10
Hello Friend!
I own a 2005 Nissan Pathfinder and there's several things u nd 2 knw. 1. There's a recall for a known issue in the fuse box that causes a short and the engine to stall when driving. 2. If you haven't done so already, switch your Nissan radiator with an aftermarket one a.s.a.p. or you'll spend $5,000 replacing the transmission!! The factory radiators leak coolant into the transmission and KILL it and the Valve Body around 90-100K Miles. Trust me, I spent 7K doing it twice because I didn't believe it!
November 12, 2019
Dennis M
what brand are these?July 17, 2021
Jeff M
10
DIY solutions brand parts are manufactured by various aftermarket companies specifically for us and built to your vehicle's exact OEM specifications.
July 21, 2021
Cristina P
I HAVE A 2005 NISSAN QUEST, MY SCANNER SAID THAT THE PROBLEM WAS BANK 1 SENSOR 2....
THE MECHANIC SAID I NEEDED 2 WIDE BAND SENSORS FOR THIS CAR
IS THIS THE CORRECT INFO FOR THIS CAR????October 23, 2021
MS. BARBARA C
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