Where Are My O2 Sensors Located on a 1997 4runner 3.4

02-01-2012, 02:53 PM

Simple wonder guys but I've done so many searches with no specific luck.....go for you buns help, I'd similar to do this this week.

I've got the check engine light on, took IT to Autozone, they said it was 02 sensor at bank 1, sensor 1. I bought the 02 sensor &adenylic acid; neediness to change it out, but where can I specifically find it (no super mechanically inclined, merely I think I can arrange the job). Likewise, any tips/tricks?

Thanks guys

02-01-2012, 03:25 PM

yeah, all goody-goody advice from pitbull. But, being that your in Sunshine State, I doubt you'll take to heat up anything. Rust is probably non a medium-large military issue for you if your truck was always in Florida.

Sol, basically. Make sure you have the right O2 sensor. If it's a denso like it should be then it does come with a gasket. And you derriere almost certainly reuse the two (10mm? 12mm?) bolts that detach the old one.

Genuinely simple task. Two bolts, Nonpareil electrical connector. 15 minutes tops.

Oh yeah, and sensor 1 bank 1 will be the front O2 sensor. So, on the eat up tobacco pipe in front of the chemical process converter.(closest to the engine)

one more Buckeye State yeah. If you feel so salient some antisieze on the bolts during refabrication International Relations and Security Network't a bad idea.

02-01-2012, 04:27 PM

Don't use a sleigh hammer when a rock hammer bequeath do. First, examine a 6 sided 12mm socket along the nuts. If they won't budge or feel like they'll round off, shoot the whole kit and boodle with some PB Blaster and Army of the Righteou information technology posture a spell and then try it again. If they are in bad regulate, buy many new nuts to put back them with and use some anti-sieze on them when you put them back on. Mine were rusted pretty bad and wouldn't come off with a standard/cheap typewrite 12mm socket, even though I smash them with PBB 24 hours prior and 2 hours prior to trying to remove them. I let them sit another 24-hour interval and borrowed a 6 sided socket and they came right remove. But I put new untarnished kookie back on and smeared them with anti-sieze.

I detest to ask what brand you said it much you salaried for the sensor. Denso is the recommended brand and they can Be had online reasonably cheap. Bosch sucks and can toll up to 3 times as overmuch over the counter.

02-01-2012, 07:18 PM

Quote:

Originally Posted past T4R_Finally View Post

Don't use a sleigh hammer when a rock hammer bequeath do. First, try a 6 sided 12mm socket on the nuts. If they won't budge or flavor like they'll round off, shoot the works with approximately PB Chargeman and let it posture a spell and then try it again. If they are in bad shape, buy some unexampled nuts to supercede them with and use some anti-sieze on them when you put them back on. Mine were rusted pretty bad and wouldn't chip off with a criterional/cheap type 12mm socket, even though I strike them with PBB 24 hours prior and 2 hours prior to trying to remove them. I let them sit some other day and borrowed a 6 sided socket and they came right soured. But I put new-sprung stainless nuts dorsum on and smeared them with anti-sieze.

I hate to ask what brand and how much you paid for the sensor. Denso is the recommended brand and they can be had online fairly cheap. Bosch sucks and can toll high to 3 times as overmuch over the counter.

Thanks guys -all great info. The bolts aren't bad, like mentioned to a higher place IT's been in Florida so it shouldn't exist a problem getting bump off. And yes, it is a Bosch, was $109 but my friend had an employee discount for 25% off, OEM fit, so I couldn't pass information technology up.

My original call into question quieten stands though, which O2 detector is bank 1, sensor 1 and where is it located precisely, so I know I'm changing forbidden the right one!! And I thought process there were 4 O2 sensors??

02-01-2012, 07:39 PM

Quote:

Originally Posted by PitbullRescuer View Post

You for sure it was a coil and not the O2 sensor? Bank 1, Sensor 1 doesn't bring i sense for information technology being an O2 detector. I could be wrong, I'm atomic number 102 expert but sound right to ME. Sensor 1 should be the up stream sensor though, the one before of the throw up.

Yeah, a pair off people at Autozone said it's an O2. I'm beautiful sure it's the one in movement of the cat besides, just want to make sure before I do all the work to the wrong detector. Anyone else confirm?

02-01-2012, 08:01 PM

Citation:

Originally Posted by daMicr0wav3 View Post

Yeah, a couple people at Autozone said it's an O2. I'm pretty sure it's the united in frontmost of the cat too, just want to make fated before I coiffe all the work to the wrong sensor. Anyone else sustain?

On '98 and earlier, and '99 and '00 49-United States Department of State rigs, both sensors are definitely O2 sensors. Sensor 1 is always the pre-cat sensor, somewhere betwixt the computerized axial tomography and the engine. Sensor 2 is post-cat, between the cat and the muffler. All 3G's have just two exhaust sensors; in that respect is no more Coin bank 2 exhaust.

For to a lesser degree $109 you could have gotten a Denso O2 sensor connected Amazon (same as factory). Bosch sensors oftentimes cause problems.

02-01-2012, 09:10 Premier

Quote:

In the first place Posted aside daMicr0wav3 View Post

Thanks guys -all great info. The bolts aren't bad, like mentioned above it's been in FL so it shouldn't be a job acquiring off. And yes, it is a Bosch, was $109 but my friend had an employee push aside for 25% off, OEM go, so I couldn't pass information technology up.

My original question still stands though, which O2 sensor is bank 1, sensing element 1 and where is it located exactly, so I know I'm changing out the right one!! And I thought there were 4 O2 sensors??

I answered your question in post 3? I dead reckoning mayhap i didn't give adequate detail?

02-01-2012, 10:28 PM

Quote:

Earlier Posted by HCurphy View Post

I answered your question in post 3? I guess maybe i didn't generate enough contingent?

AAH, I go steady it now, was reading the e-mail responses and not happening the forum. Props to you foremost

Well I have the receipt, maybe I can return information technology and get a Denso.

Typing it in on Amazon River and to save me more or less looking at up, does anyone know which one IT would be for the Bank 1, Sensor 1 on here

02-01-2012, 10:44 PM

Quote:

Originally Posted by daMicr0wav3 View Post

AAH, I see it now, was reading the e-mail responses and not on the forum. Props to you first of all

Well I have the reception, maybe I can return it and incur a Denso.

Typewriting it in connected Amazon and to save me some looking up, does anyone know which one it would be for the Rely 1, Detector 1 connected here

Look Here:DENSO Aftermarket Online Catalog | Fomite Parts Search

Looks like a 234-4161 if you undergo the V6.

HTTP://www.amazon.com/Denso-234-4161...ar=1&carId=004

02-01-2012, 02:53 PM	#1

Member	02 detector location Simple wonder guys but I've done so many searches with no specific luck.....go for you buns help, I'd similar to do this this week. I've got the check engine light on, took IT to Autozone, they said it was 02 sensor at bank 1, sensor 1. I bought the 02 sensor &adenylic acid; neediness to change it out, but where can I specifically find it (no super mechanically inclined, merely I think I can arrange the job). Likewise, any tips/tricks? Thanks guys __________________ 98 SR5, 5spd 4x4, 185k - My Fishing Savage! Owner/Operator of www.ReelsAndTackle.com Feedback 1
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02-01-2012, 02:59 PM	#2

Senior Member	O2 sensor is in the exhaust. There's i before the cat and one later on it. Get a small torch and passion the sh*t out of the nuts, get them glowing red, then they'll come right off. 12mm wrench or socket. If the nuts are real unhealthy you'll need to use vice grips. Work sure the new sensing element has a unaccustomed gasket, other wise you'll need to bargain one. If the nuts need vice grips to get them off, buy 2 new ones overly. Ahead you buy the sensor, double check-out procedure to see if you have Cali or Federal Emissions. (the sensing element is different depending on which you have)
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02-01-2012, 03:25 PM	#3

Member	yeah, all goody-goody advice from pitbull. But, being that your in Sunshine State, I doubt you'll take to heat up anything. Rust is probably non a medium-large military issue for you if your truck was always in Florida. Sol, basically. Make sure you have the right O2 sensor. If it's a denso like it should be then it does come with a gasket. And you derriere almost certainly reuse the two (10mm? 12mm?) bolts that detach the old one. Genuinely simple task. Two bolts, Nonpareil electrical connector. 15 minutes tops. Oh yeah, and sensor 1 bank 1 will be the front O2 sensor. So, on the eat up tobacco pipe in front of the chemical process converter.(closest to the engine) one more Buckeye State yeah. If you feel so salient some antisieze on the bolts during refabrication International Relations and Security Network't a bad idea. __________________ '96 SR5 2wd 275k miles TBU 231's-Brembo Rotors, '99 Tall coils, Billsteind HD 4600 series, FJ Cruiser 17", 265/70/R17 Terra Grapplers [ complete original other then melodic phras-ups, oil changes, front o2, u-joints, and axle seals ] Last altered by HCurphy; 02-01-2012 at 03:28 PM.
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02-01-2012, 07:18 PM	#6

Member	Quote: Originally Posted past T4R_Finally Don't use a sleigh hammer when a rock hammer bequeath do. First, try a 6 sided 12mm socket on the nuts. If they won't budge or flavor like they'll round off, shoot the works with approximately PB Chargeman and let it posture a spell and then try it again. If they are in bad shape, buy some unexampled nuts to supercede them with and use some anti-sieze on them when you put them back on. Mine were rusted pretty bad and wouldn't chip off with a criterional/cheap type 12mm socket, even though I strike them with PBB 24 hours prior and 2 hours prior to trying to remove them. I let them sit some other day and borrowed a 6 sided socket and they came right soured. But I put new-sprung stainless nuts dorsum on and smeared them with anti-sieze. I hate to ask what brand and how much you paid for the sensor. Denso is the recommended brand and they can be had online fairly cheap. Bosch sucks and can toll high to 3 times as overmuch over the counter. Thanks guys -all great info. The bolts aren't bad, like mentioned to a higher place IT's been in Florida so it shouldn't exist a problem getting bump off. And yes, it is a Bosch, was $109 but my friend had an employee discount for 25% off, OEM fit, so I couldn't pass information technology up. My original call into question quieten stands though, which O2 detector is bank 1, sensor 1 and where is it located precisely, so I know I'm changing forbidden the right one!! And I thought process there were 4 O2 sensors?? __________________ 98 SR5, 5spd 4x4, 185k - My Sportfishing Beast! Owner/Operator of www.ReelsAndTackle.com Feedback 1
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02-01-2012, 07:28 PM	#7

Senior Member	You sure it was a curl and non the O2 sensor? Bank 1, Sensor 1 doesn't make sense for it being an O2 sensor. I could be wrong, I'm no expert but sound right to Maine. Sensing element 1 should be the up stream sensor though, the one in strawma of the cat.
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Where Are My O2 Sensors Located on a 1997 4runner 3.4

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02-01-2012, 07:39 PM	#8

Penis	Quote: Originally Posted by PitbullRescuer You for sure it was a coil and not the O2 sensor? Bank 1, Sensor 1 doesn't bring i sense for information technology being an O2 detector. I could be wrong, I'm atomic number 102 expert but sound right to ME. Sensor 1 should be the up stream sensor though, the one before of the throw up. Yeah, a pair off people at Autozone said it's an O2. I'm beautiful sure it's the one in movement of the cat besides, just want to make sure before I do all the work to the wrong detector. Anyone else confirm? __________________ 98 SR5, 5spd 4x4, 185k - My Fishing Animal! Owner/Wheeler dealer of www.ReelsAndTackle.com Feedback 1
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02-01-2012, 08:00 PM	#9

Phallus	It is the one in face of the cat, just soak it in some pb blaster, have it sit. Take IT dispatch and supervene upon it, plug it in and lucid the code! Tilt mistake it for the wrong one, it's right off the engine on the exhaust. The downstream sensor is happening the other side of your cat. __________________ 2000 2.7L 4Runner 185K Millenary Silver, BFG Every last Terrain, T/A Knockout 31x10.50/15, Scanguage Two, Front D-Rings, Filled Weathertech, 15% Head-on Tone, 6500K HID
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02-01-2012, 09:10 Premier	#12

Extremity	Quote: In the first place Posted aside daMicr0wav3 Thanks guys -all great info. The bolts aren't bad, like mentioned above it's been in FL so it shouldn't be a job acquiring off. And yes, it is a Bosch, was $109 but my friend had an employee push aside for 25% off, OEM go, so I couldn't pass information technology up. My original question still stands though, which O2 sensor is bank 1, sensing element 1 and where is it located exactly, so I know I'm changing out the right one!! And I thought there were 4 O2 sensors?? I answered your question in post 3? I dead reckoning mayhap i didn't give adequate detail? __________________ '96 SR5 2wd 275k miles TBU 231's-Brembo Rotors, '99 Tall coils, Billsteind HD 4600 series, FJ Police car 17", 265/70/R17 Terra Grapplers [ all original other past air-ups, oil changes, presence o2, u-joints, and axle seals ]
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02-01-2012, 10:28 PM	#14

Phallus	Quote: Earlier Posted by HCurphy I answered your question in post 3? I guess maybe i didn't generate enough contingent? AAH, I go steady it now, was reading the e-mail responses and not happening the forum. Props to you foremost Well I have the receipt, maybe I can return information technology and get a Denso. Typing it in on Amazon River and to save me more or less looking at up, does anyone know which one IT would be for the Bank 1, Sensor 1 on here __________________ 98 SR5, 5spd 4x4, 185k - My Sportfishing Beast! Possessor/Operator of www.ReelsAndTackle.com Feedback 1
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