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Old 05-03-2006, 10:17 PM #1
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Planning to change O2 sensor
I am about to change my oxygen sensor on my own as this guide seems like its a simple process. I have a few questions however:

1) What is the part number/site that carries a new oxygen sensor..? Also how much? I live in California.

2) Are there anything I need to look out for when installing the O2 sensor? Where is the O2 sensor located?

3) Should I go to a pro? lol
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Old 05-03-2006, 11:01 PM #2
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Re: Planning to change O2 sensor
Quote:
Originally posted by NViejeP
I am about to change my oxygen sensor on my own as this guide seems like its a simple process. I have a few questions however:

1) What is the part number/site that carries a new oxygen sensor..? Also how much? I live in California.

2) Are there anything I need to look out for when installing the O2 sensor? Where is the O2 sensor located?

3) Should I go to a pro? lol
Check out urdusa.com for an 02 sensor. They're pretty cheap from these guys. It's a pretty simple bolt off and bolt on affair.
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Old 05-04-2006, 08:24 PM #3
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I replaced mine a few months ago...there are 4 of them....2 on either side....one before the cat converter and one after....do you know which one is the bad one?....a diagnostic machine will tell you which it is so as to save you time and money guessing between the four of them.....it's fairly staright forward but do a search for threads on this subject....there's lots of info to read up on it available....good luck!.
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Old 05-04-2006, 08:45 PM #4
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Quote:
Originally posted by racefan_67
I replaced mine a few months ago...there are 4 of them....2 on either side....one before the cat converter and one after....do you know which one is the bad one?....a diagnostic machine will tell you which it is so as to save you time and money guessing between the four of them.....it's fairly staright forward but do a search for threads on this subject....there's lots of info to read up on it available....good luck!.
You should normally not have to change the 02 sensor after the cat. The one that throws a code is the one before the cat...
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Old 05-04-2006, 09:09 PM #5
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well, I guess I was one of the 'rare' ones because I changed the right side o2 sensor after the cat....everything on the dash reset itself after that and no problems since....
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Old 05-04-2006, 10:07 PM #6
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I'm talking about the air/fuel ratio sensor, also known as the wide range sensor. Which one is that?
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Old 05-04-2006, 10:27 PM #7
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.....not too sure which or where that one is...we may be talking about two separate sensors.....mine was diagnosed by the dealership ...( I'm at work and don't have the paperwork but I think it was b1s2 (Bank 1 sensor 2))and I bought the part separately and did the change in about 10 minutes....you have me wondering now if they are the same or different sensors....we'll have to dig a bit more....post any new info and I'll do the same...
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Old 05-05-2006, 10:15 AM #8
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Quote:
Originally posted by NViejeP
I'm talking about the air/fuel ratio sensor, also known as the wide range sensor. Which one is that?
From what I know (and this is very little), the more expensive 02 sensor is called a air/fuel ratio sensor. Chalk it up to if you can get away w/ the cheaper Denso, you have a regular 02 sensor. If not, then you have the fancy shmancy one...
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Old 05-05-2006, 01:02 PM #9
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The O2 sensors in the forth generation 4runners do not use the newer Wide Range type O2 sensors, commonly referred to as
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Old 05-05-2006, 08:12 PM #10
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....thanks for clarifying that greasefingers.....I didn't remember seeing any air to fuel o2 sensors on my diagram of the exhaust system.....made me wonder though.....
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Old 05-06-2006, 02:21 AM #11
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No, I dont know if I will have time to clean the MAF, I've got work Saturday and Sunday afternoons, and got tons of homework.

Looks like it has to wait till next weekend.
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Old 02-04-2016, 09:11 PM #12
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Location of bank 1 sensor 1
Can anyone tell me where the O2 sensor: Banc 1 sensor 1 is? The picture would be very helpful.
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Old 02-04-2016, 10:23 PM #13
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dangros, try this: 2005 V8 Limited: P2195 Sensor Location

It's between the manifold & the 1st cat.
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Old 09-20-2017, 07:46 PM #14
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Cats and o2 sensors
There are two sensor types:
A/F or air/fuel or upstream is located before the cat attached to the manifold banks on either side of the engine. The O2 sensor or heated air or downstream is located after. The first senses the amount of unburnt fuel and adjusts for air/ fuel mixture in the ecu. The second senses the amount of oxygen in the exhaust after the cat, which tells the ecu about your emissions and your cat's functioning. The first should show a code on either bank 1 or bank 2 if there is an issue. I highly recommend replacing both before you take the cat out. It will improve performance and fuel consumption and demystify whether or not your cat works.
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Old 07-18-2019, 05:04 PM #15
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Bolt off, Bolt on? How the heck do you reach the plugs? I'm not beefy by any means, but I can't get my hands in there to disconnect B1 upstream or B2 downstream sensors. It's driving me crazy. Anyone have vids or tips on reaching these puppies?
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