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Need to change upstream o2 sensor on 2003 toyoya tacoma & have not figured out how to access wireing plug on top of transmission.Very tight space and I cant see it. Thanks Bruce

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 169 Answers

SOURCE: Upstream O2 sensor location?

That is the first sensor closest to the engine. The downstream sensor is the one behind the converter.
Good luck.
Please rate this response , and let me know if ya need more help!

Posted on Aug 31, 2008

fixitriteman
  • 431 Answers

SOURCE: I have replaced the o2 sensor the upstream one

i find most o2 problems aren't o2 problems they are fuel delivery problems like partly plugged fuel filters or temp sensors or dirty air filters the worst ones are bad catalytic converters that is always last resort

Posted on Mar 12, 2010

Pointnino
  • 14 Answers

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.

Posted on Apr 05, 2010

duane_wong
  • 6826 Answers

SOURCE: Where are the four O2 sensors on a 2003 Montero

According to the service literature I read, the 2003 Montero Sport with the 3.0 or 3.5 L engine does not have O2 sensors listed even in the maintenance schedule. The 2.4 L engine has it on the exhaust manifold though.
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However, the following lists the par, though for before or after the catalytic converter:

http://www.partstrain.com/store/index.php?VN=4294967180+4294966587+4294964143+&Nr=AND(universal:0)&N=0&Ntt=Oxygen%20Sensor

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I think that $250 to $300 is reasonable if the Oxygen sensors are stuck in there with rust and the threads are preserved by the technician. Oxygen Sensor replacement can be tricky.
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Good luck on this repair.

Exhaust Manifold

REMOVAL & INSTALLATION

2.4L Engine


  1. Remove or disconnect the following:

    • Negative battery cable

    CAUTION
    Wait at least 90 seconds after the negative
    battery cable is disconnected to prevent possible deployment of the air bag.


  2. Heat cowl from the exhaust manifold
  3. Aspirator valve assembly, if equipped
  4. Oil dipstick and guide
  5. Oxygen (O2S) sensor connector and ground cable, if equipped
  6. Exhaust pipe from the manifold
  7. Exhaust manifold and gasket from the engine
    To install:

  8. Install or connect the following:

    • Exhaust manifold. Torque the M8 mounting nuts to 22 ft. lbs. (29 Nm) and the
      M10 mounting bolts 36 ft. lbs. (49 Nm). starting from the middle and working
      outward.
    • O2S sensor connector and ground cable, if equipped
    • Exhaust pipe to the manifold. Torque the nuts to 35ft. (49 Nm).
    • Aspirator valve assembly, if removed
    • Heat cowl to the exhaust manifold. Torque the bolts to 117 inch lbs. (13
      Nm).
    • Negative battery cable

  9. Start the engine and check for exhaust leaks.


3.0L and 3.5L Engines


  1. Remove or disconnect the following:

    • Negative battery cable
    • Exhaust pipe from the exhaust manifolds
    • Oil dipstick, guide and O-ring
    • Heat shields
    • Exhaust manifolds

  2. Clean the gasket mounting surfaces. Inspect the manifolds for cracks,
    flatness and/or damage.
    To install:

  3. Install or connect the following:

    • New gasket and exhaust manifold. Torque the nuts to 33 ft. lbs. (44 Nm) on
      3.0L engines and 22 ft. lbs. (29 Nm) on 3.5L engines.
    • Heat shield, Torque the bolts to 10 ft. lbs. (14 Nm).
    • Exhaust pipe to the exhaust manifolds. Torque the nuts to 35ft. (49 Nm).
    • Oil dipstick, guide and new O-ring
    • Negative battery cable

  4. Start the engine and check for exhaust leaks.


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Posted on Oct 07, 2010

Testimonial: "Thanks, it gave me some assurances the work was reasonable. I am pretty handy, this would have been new territory. Others made it sound VERY simple."

ameezle
  • 100 Answers

SOURCE: where is 2003 avalon o2

Hi, the sensor is on the front exhaust manifold. Here is a picture of the sensor you need to replace..... You should be able to replace it yourself.
ameezle.jpg

Posted on May 31, 2011

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1 Answer

I change both o2 sensor but the code is still coming on the wires ok what can be the problem


Usually an O2 sensor code is a result of another problem. Your problem is coming from the motor & the sensors are just reading it. Bad wires,coils, plus, vacuum leaks even low coolant or running hot will give you O2 sensor codes. Sounds likes you should start on wires themselves. Is it running rough? Missing? Check the plug wires & coils first. Disconnect the batt to clear the codes & take it from there. Good Luck

Sep 23, 2015 | 2002 Toyota Tacoma

1 Answer

I am changing my upstream o2 sensor. on the original sensor it has 2black 1blue 1white wire. which one is the signal return and 2 heater wires?


If you have a universal sensor return it & get the
correct one, that is exact to the original & plugs in

Jul 09, 2012 | 1999 Kia Sportage

1 Answer

O2 sensor


the 02 sensors are in the exhaust system, screwed into exhaust like a spark plug. it is your upstream sensor. to change the sensors, first remove the wire to it, get a 02 sensor socket from the auto parts store. use the rachet and socket to take it out. good-day !

Apr 17, 2012 | 2003 Honda CR-V

1 Answer

I think I need to change the o2 sensor. I don't know where it is. I also heard it takes a special socket. Help if you can. Thanks in advance. Glen


get the car up on a lift and follow the exhaust from the tail pipe forward. you will find a large bump in the pipe near the transmission, this is the catalytic converter. if your car was made after 1994, there
will be an O2 sensor in front of and behind the catalytic converter. these are called the upstream and downstream sensors. the upstream one may be so upstream that it is actually screwed into the exhaust manifold. buy one of each sensor, take it to a muffler shop and pay them 20 bucks to install for you. with a lift it is so easy and they have a long-*** wrench there just for that purpose. doing this laying on your back in the gravel is a pain and they are so rusted in that you will see why a long-*** wrench is needed to make it quick and easy. do yourself a favor and spend an extra few bucks and get sensors which are made to plug right into your cars wiring, not generic ones which have to be figured out.

Jun 26, 2011 | Chevrolet Cavalier Cars & Trucks

1 Answer

My 2002 ford e-150 is pulling p1131 code and p1151 code what is the problem


Lack of upstream heated O2 sensor bank 1 & bank 2. I would first check for broken or corroded wires to both upstream O2 sensors. If no apparent bad wires O2 sensors are bad.

Oct 11, 2010 | Ford E-150 Cars & Trucks

1 Answer

How do I find out which O2 sensor needs replacing?


USUALLY IT IS THE UPSTREAM SENSOR THAT IS MOST IMPORTANT ..TRY THAT ONE FIRST..ITS LIKE CHANGING A SPARK PLUG...PROBABLY IN THE 25$ RANGE..TO DO IT YOURSELF THAT IS..

Jun 15, 2010 | 2003 Ford Focus

1 Answer

2001 Tacoma running rich but the scanner is reading a lean code


No, disconnecting the sensor and seeing no change would be a indication the maf was bad. Your computer takes information from your mass air flow sensor (maf), o2 sensor, cam position, and knock sensor to regulate the correct mixture. I would suspect a bad o2 sensor upstream. Try taking off the o2 sensor and seeing if there is black carbon on the base of the o2 sensor. If it has black carbon on the base it could be a bad o2 sensor. This problem could also be easily solved by hooking up a mechanics diagnostic computer to pin point the problem. Sometimes, you can clean the mass air flow with a special cleaner to help it generate a more accurate reading.

Apr 20, 2010 | 2001 Toyota Tacoma

1 Answer

Universal o2 censor has 2 white 1gray 1black existing wires areblack/tan dkgreen/orng blk/ltbl blk/pink


First what do you mean by a universal o2 sensor? You must make sure that you have the right o2 sensor, most newer vehicles have four o2 sensors 2 upstream and 2 downstream, upstream and downstream are meant to show where the sensors are in relation to the catalatic converter,some o2 sensors have 1 wire or up to 4 wires most with four wires are heated o2 sensors so you need to be sure you ve gotten the right o2 sensor for you vehicle as well as the right replacement for the proper location! My experience is that most after market o2 sensors have the same colored wires as the vehicle. Also most o2 sensors have electrical plugs? If you need help finding the right o2 sensor for your vehicle then please dont be affraid to ask!

Feb 12, 2010 | 1996 Jeep Grand Cherokee

1 Answer

I have 2008 toyoya tocoma truck only getting 13 mpg. the check engine light on, had it scope out said o2 sensor open, replced sensor had light cancel but came back on. still have problem


Are you sure you replaced the right 02 sensor? Some vehicles have up to 4 02 sensors and being the ones that have a seperated duel exhaust system. You will have an 02 sensor located upstream of the catalytic converter and one down stream of the converter so make sure you replaced the right on. If you used a scanner to tell you it was an 02 sensor it should have also told you bank one or bank two which translates to drivers side or passengers side will also tell you up stream or down stream.

Dec 01, 2009 | 2008 Toyota Tacoma

2 Answers

Exact location of downstream O2 sensor.


Downstream O2 sensor is after (downstream) the catalitic converter on the exhaust pipe. Upstream O2 sensor is after (downstream) the engine exhaust manifold - before (upstream) the catalitic converter. Upstream O2 sensor controls air-to-fuel ratio to yield a small excess oxygen. Downstream O2 sensor assesses the catalitic converter performance.

Sep 22, 2009 | 2003 Pontiac Vibe

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