Hi,i would like to know if this is a downstream or upstream sensor .From what i asked for i would think it should be a downstream
453099
When I researched it for mine, came back as upstream, which is where mine is installed. Now referred to as "alternative fit" in Bosch fit guide. I haven't had any problems so far....
453100
It could be universal but most likely a down stream by the connector adaptor.
453101
Just look at the plug connector on the sensor your replacing, there are two types. Get the one that has the same style that needs replacing. Easy peasy!
823121
They are different. Theres the ACdelco AFS105 and AFS106 ones upstream the other downstream. I don't remember which ones which.
1755335
If you go to the Denso website, there is no universal number listed for the upstream or pre-cat. After an exhaustive search on the internet, I could not come up with a universal number for the upstream part. Maybe ask different Scion or other forums where a tech could answer. I have used this part for downstream replacement and has been good for 3 years.
823123
I believe there is only one style downstream sensor and they are different style plug than the others.
408976
If it has two sensors you will have a upstream and downstream sensor you need to scan to find which one is bad.
1331343
I can't speak for your car but as I understand it, upstream is the sensor closest to or before the catalytic converter and others after that are referred to as downstream. Sensors after the cat are not very important and although they might turn on the "check engine" light, they will have no effect on the engine performance, they simply measure emissions. I know some in the know will solder a resistor in to negate the unit so it won't turn the light on. The upstream sensor is the important one. It would seem to me that if the connectors going to the sensor are the same colors then I would install the same sensor whether upstream or downstream. If the wire colors are different, then I would assume that the sensors are different. Hope this helps and good luck. Bob
1678823
On my car it's on/near the rear exhaust manifold within the engine bay. The 2nd sensor is on the catalytic converter. I bought a new sensor just to be safe when I had this part installed.
1236127
Both sensors are the same part number. You either replaced the wrong sensor, both are bad, or you have an electrical issue.
1990572
I am not sure what you mean by down stream. We used the part on a 1997 Toyota 4Runner. It replaced the oxygen sensor on the front side. The removal of the old part and installation of the new part took less than fifteen minutes. The new part works fine and we longer get the check engine code that indicated the original oxygen sensor had failed. We saved $160.00 by purchasing this part from Amazon and installing it ourselves. In fact, my grandson crawled underneath the car and did it for us. As for finding an answer to your question, you might do an Internet search for upstream vs downstream oxygen sensors for your automobile. Autozone or another auto part shop will check the check engine light code for you for free. Toyota wanted $49.00 just to tell us what code had caused the light to come on. My son did a search on the Internet to find the lowest price replacement part. We were delighted with the results. We got the part quickly and it fixed the problem.
1446237
Lenny is correct. The upstream and downstream are typically different on GM vehicles (Chevrolet, GMC, Pontiac, Buick, Oldsmobile to name a few). I never have understood why the sensors are different; externally only the electrical connectors are different, but maybe internally there's a difference...I don't know. What I usually do is use another website, typically RockAuto.com, to look up part numbers. The description will tell you UPSTREAM or DOWNSTREAM. Then I bring that part number to Amazon and see who's cheaper. Typically Amazon is since RockAuto charges shipping and sales tax (at least for me anyways; in WI). Lenny, you got lucky! I replaced all my O2 sensors on my K1500 Z71 and I'm still at 16-17mpg tops; hit 20mpg once doing 60mph for a 400mi trip.
624407
Yes there is if you look at the connector on them you will see one is a 4 prong male and one is 4 prong female also it should say witch is upstream and down stream ,have a look at your old ones BEFORE you order.save your self trouble by making sure you get the right one the first time
1558003
This sensor is both bank one and bank two sensor 2. Sometimes referred to as left or right, upstream and downstream. These are the downstream ones.
309736
I put it in the upstream spot but it is listed as "universal" which makes me think it would work in either position. Be aware that it is not supplied with connectors. The buyer must splice extant connectors onto the Denso sensors wiring.
1283268
Each vehicle is different in the amount of O2 sensors they have. Could be 1-4 or even more.If you know you only have two, the upstream is before the converter and the downstream is after it.You need to know which is bad before you replace it. Most parts stores can scan you vehicle and tell which one is suspect.
1606636
You should have 4 total, 2 upstream and 2 downstream. Sensor 1 is upstream, sensor 2 is downstream. Bank 1 is drivers side bank 2 is passenger side I think
1812063
Need to know the make and model and engine type of the car to answer this question. Are you asking about bank 1 vs bank 2, or are you asking about upstream vs downstream? Go to the Denso web site to see what sensor you need. http://densoautoparts.com/find-my-part/vehicle-selection
1608973
I bought only the sensor. I'm on my second sensor now I got about a years use out of the first one.