Need to replace o2 sensor bank 1 sensor 1 on my 97 4runner 2wd limited v6 but which is it wheres it located

Question edited for clarity.
Question moved to model category.

As a general rule, with a laterally positioned V6 , Bank 1 is always closest to the firewall Bank 2 is closest to the headlights.

Sensor 1 is ALWAYS the one in the Exhaust Manifold, and Sensor 2 is ALWAYS the one AFTER the Catalytic converter.

confirmed here

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Bank One and Bank Two refer to the sides of the V shape layout of the engine. Stand with the engine belts and pulleys nearest to you and the transmission (Gearbox) furthest away from you. Bank One is the Left side of the engine as you are looking at it, Bank Two is the right side. You need to look at the exhaust manifold and exhaust pipes on the RIGHT side of the engine.
There are Two o2 sensors in each exhaust, (4 in total on a V6 engine), One before the Catalytic Converter and one after it. They are labelled as Sensor One, (Before the Catalytic Converter), and Sensor Two, (After the Catalytic Converter).
'Sensor One' o2 sensors are sometimes mounted directly into the exhaust manifold nearest the engine or possibly in the Catalytic Converter itself.
'Sensor Two' o2 sensors are further down the exhaust ,often in the bend as it turns to go under the vehicle.

Please read about this fault code and its possible sources. P1167 Hyundai O2 Sensor System Lambda Controller at the Limit Bank 2

There are 2 O2 sensors on each bank. Here are some pics of where they are located:


mazda tribute o2 sensor location Google Search

Usually these are located on the exhaust manifold or just below the exhaust manifold and you should be able to see it in the engine bay. On V6 engines there will be one sensor on each of the 2 exhaust banks.
You will probably need to remove the engine cover to see the sensors on your exhaust.

If someone told you to replace these because you got a particular fault code I would be wary. A decent scan tool and basic diagnostics can show if the 02 sensor is working or not. Some faults often blamed on an 02 sensor are not due to faulty sensors.

If this is a V6 model, Bank 1 would indicate one side of the motor. Also, if it's the V6 model, I believe there are 3 O2 sensors, one per Bank, and one downstream(post-cat). If it is the V6 model, and it indeed is Bank 1, then just replace the O2 sensor, that's the most likely cause.

I would google that to find out more

B2 should be bank #2 & S1 the upstream
sensor closest to the engine before the converter

I assume it has two banks as in a V6!

in the exhaust pipe after the cat converter of the bank closest to the firewall

Should be in the manifold on the back side closest to the firewall.

I think the question is where is the bank 2 precat sensor on the 2.8 v6 passat. I have only found bank 1......????