Different this is rock auto and the different companies and location of 02 sensors you can use this as a reference and when using ebay check the compatibility will tell if up or downstream
http://www.rockauto.com/en/catalog/honda,2005,odyssey,3.5l+v6,1430835,exhaust+&+emission,oxygen+(o2)+sensor,5132
There should be just 2 02 sensors on your car an upstream and a downstream
Here is the link for both the upstream and downstream 02 sensor
Amazon com B072WPRVF6
The answer was incomplete, and the link did not help -- tried to sell me two sensors without distinguishing if they are the same or different for upstream and downstream. The confusion has not been cleared up, and eBay has better prices -- but still does not tell you which is what....
Sorry for the confusion, they are different. There is an upstream and downstream sensor. I just recommended a cheaper brand I have had good luck with on Amazon.
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SOURCE: 2005 Subaru Legacy: Where are the O2 sensors located (both)
the o2 sensors are locted in the exhaust system. upstream is before cat converter, downstream is after cat converter.
SOURCE: 1997 Dodge Stratus V6 oxygen sensor location
Upstream, as in ahead of the converter, back toward engine. Start at converter and work your way back, should be on exhaust pipe or even on manifold.
SOURCE: Getting PO141 trouble code when scanning! Car '03 accord, 2.4 ltr
i spoke to a honda tech , and he confirmed code p0141 on the 4cylinder model is the second sensor.
SOURCE: 2001 elantra replaced cat o2 sensor upstream and
In reading what you've already done, I would suggest a Compression Test along with a vacuum gauge hooked up to the intake manifold. It may be that you're burning oil through your exhaust system in the catalytic converter. I've seen this with leaking or inoperative turbo-chargers. Pull all of your spark plugs, marking them as to what cylinder they went in with a Sharpie and if worn, replace them. Check the distributor cap & rotor button for wear or cross-firing. A Haynes Manual for your vehicle is available through most part stores which is truly effective for your DIYer. Bad plug wires can send unburned gases down through both O2 Sensors and the Catalyst. You may also want to check the plug wires and the coil(s). A fast way of checking plug wires is to grab all of them with your hand with the vehicle running and if you get "zapped"...you need spark plug wires. Remember, the codes you pull are just a general starting point as to where to start your diagnostics, not the exact problem itself. The computer doesn't monitor the mechanical aspect of your engine nor the fuel supply. The computer will take this as a given, so don't forget that when testing that it could be a compression problem or fuel problem, but as I first said...an oil leak fouling your exhaust system such as an inoperative EGR valve or oil leak on the exhaust side of the valve train.
I hope this Helps,
"00 Buck"
SOURCE: engine code P0174 lean bank
Itys upstream its the one in front of the cataylic convertor not y pipe or behind the convertor
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