Is the car 4 cylinders or 6?
either one here are pics of where they are located good luck 
Follow exhaust from engine manifold down and it is the one sticking out side of exhaust before catalytic converter.
I don't know your vehicle well enough to answer that but I can tell you that if you ask O'Reilly they will not only show you where it is but they will most likely print off an engine diagram for you in detail. Keep it, this will come in handy for you later as well.
SOURCE: check engine light
B1S1 O2 sensor is threaded into your exhaust manifold, closest to the actual engine in the exhaust stream.
SOURCE: Where is Bank 2 Sensor 1 (B2S1) O2 sensor located on a 1999 Siena
Bank one, sensor one is on the front of the engine, closest to the radiator.
Bank TWO, sensor one, is on the back of the engine, cosest to the firewall. That one is not easy to change, unless you have access to a vehicle hoist. Easier to get to it from under the car.
Hope htis helps; thanks for choosing FixYa!
SOURCE: Check engine light won't stay off
you could have a short in your o2 sensor wire and there for its not reading.Get a shop to hook up a diagnotic scanner and read what they are doing so you can see if its a loss of comunication or not and then go from there.Also make sure it was factory replacement o2 sensors and not one of those multifit jobs.
SOURCE: check engine light on 2003 toyota tacoma, O2 sensor?
An O2 sensor code is a tricky one. It could mean SEVERAL different things, and I know how bad it sucks to hear this, but your best bet is to take it in and have a diagnostic ran on it at either a dealer or a good mechanic shop with a computer they can hook up to it. I had an "O2" code come up a while back on another car I used to have, and literally spent weeks and hundreds of dollars trying to fix it, and never did. Finally out of desperation took it in, paid the $90, and they found the problem and fixed it in like 30 minutes. Something I would have never even thought of was causing it (can't remember off the top of my head). After that I stopped wating time and money on check engine lights. One comes on in my car, I take it to have it ran for free at and auto parts store just to make sure it's not a loose gas cap or something, just to get an idea of what I'm looking at, then go and make an appointment to have to hooked up to a diagnostic computer to track down the problem. Good luck, and hope this helps save you some time and money.
SOURCE: 2004 Sequoia B2S1 o2 sensor
Toyota Sequoia has 4 oxygen sensors... two on each side. The ones in front of catalytic are position one, and, after are position 2.
Bank 2 is on passenger side, Bank 1 is on driver's side.
Hope this helps (remember to rate and comment this free answer).
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