1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site
    Quick Links: Reverse Light Sensor? Flywheel toughness and Marlin Crawler clutch Push button start 2000 Tacoma 3.4L 4x4 front diff fill plug Sound deadening insulation stages and how many sq ft double cab taco Truck Bed Tent for Gen 1 Tacoma 5ft bed?

02 sensor bad

Discussion in '1st Gen. Tacomas (1995-2004)' started by scyota03, Oct 2, 2012.

Page 1 of 2
  1. Oct 2, 2012 at 7:33 PM
    #1
    scyota03

    #1
    scyota03 [OP] Well-Known Member

    Joined:
    Aug 19, 2011
    Member:
    #61995
    Messages:
    75
    Gender:
    Male
    sumter,southcarolina
    Vehicle:
    03 trd prerunner
    3 inch coil spiring spacer, front bull bar
    i got a bad 02 senson on bank one. anybody kno if that tacos got 2 or 4 o2 sensors on 3.4?
     
    scyota03, Oct 2, 2012
    #1
  2. Oct 2, 2012 at 7:56 PM
    #2
    pippen

    #2
    pippen that was'nt a vitamin!!

    Joined:
    May 6, 2011
    Member:
    #56205
    Messages:
    661
    Gender:
    Male
    First Name:
    Pippen
    Eastern NC
    Vehicle:
    04 PreRunner Ext.
    I think theres one before the cat. and one after. I just replaced mine, was the one before the cat. It was'nt too bad either cept I had to clean up the threads some.
     
    pippen, Oct 2, 2012
    #2
  3. Oct 3, 2012 at 6:01 AM
    #3
    Robertgeejr1

    #3
    Robertgeejr1 Well-Known Member

    Joined:
    Dec 21, 2011
    Member:
    #69167
    Messages:
    772
    Gender:
    Male
    First Name:
    Robert
    Aorora, Ill, yeah!
    Vehicle:
    1996 Toyota Tacoma SR5 4x4
    I have done all the hi-pro mods for a life time, since I got this truck at a great price, I will be happy with showroom new.
    its your front sensor, its sort of a pain to get to but its do=able.
    plenty of good instructions on here to do it.
    one word of wisdom, go ahead and replace both. front and rear. rear is very easy.
    it will make your truck run better and get better mpg
    order them from rockauto, best price by far. and u get a 5%disc.
    get a can of power blaster and spray the nuts before you drive it for a few days, they get rusty and stuck, and this will make them spin off.
    i did both in a hour taking my time.
    just unhook neg battery cable. replace sensors hook cable, and crank.
    [​IMG]mmine when i changed them...
     
    Robertgeejr1, Oct 3, 2012
    #3
  4. Oct 3, 2012 at 6:10 AM
    #4
    98tacoma27

    #4
    98tacoma27 is going full "SANDWICH" Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    67,858
    Gender:
    Male
    First Name:
    Ben
    Not Beech Creek
    Vehicle:
    05 Tundra SR5 (+295k AND COUNTING), 2006 F350 King Ranch 6.0L
    Some stuff. Not a lot, just some.
    There's no indication it's the front.
     
    98tacoma27, Oct 3, 2012
    #4
  5. Oct 3, 2012 at 6:20 AM
    #5
    Robertgeejr1

    #5
    Robertgeejr1 Well-Known Member

    Joined:
    Dec 21, 2011
    Member:
    #69167
    Messages:
    772
    Gender:
    Male
    First Name:
    Robert
    Aorora, Ill, yeah!
    Vehicle:
    1996 Toyota Tacoma SR5 4x4
    I have done all the hi-pro mods for a life time, since I got this truck at a great price, I will be happy with showroom new.
    he seems to indicate bank one. i am guessing that is the front one.
     
    Robertgeejr1, Oct 3, 2012
    #5
  6. Oct 3, 2012 at 6:22 AM
    #6
    98tacoma27

    #6
    98tacoma27 is going full "SANDWICH" Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    67,858
    Gender:
    Male
    First Name:
    Ben
    Not Beech Creek
    Vehicle:
    05 Tundra SR5 (+295k AND COUNTING), 2006 F350 King Ranch 6.0L
    Some stuff. Not a lot, just some.
    The "bank" indicates which side of the motor it's on.
     
    98tacoma27, Oct 3, 2012
    #6
  7. Oct 3, 2012 at 6:35 AM
    #7
    DitchDoc

    #7
    DitchDoc Well-Known Member

    Joined:
    Sep 25, 2012
    Member:
    #87674
    Messages:
    89
    Gender:
    Male
    First Name:
    Logan
    Western North Carolina
    Vehicle:
    03 V6 QC TRD Limited 4x4
    2003 DC 4x4 TRD Cap K&N FIPK
    There are only 2. Number one is in front of the cat. Rockauto has the best price by far for these.
     
    DitchDoc, Oct 3, 2012
    #7
  8. Oct 3, 2012 at 7:11 AM
    #8
    pippen

    #8
    pippen that was'nt a vitamin!!

    Joined:
    May 6, 2011
    Member:
    #56205
    Messages:
    661
    Gender:
    Male
    First Name:
    Pippen
    Eastern NC
    Vehicle:
    04 PreRunner Ext.
    Yup go with RockAuto, I believe it was $108 and some change to my door :D
     
    pippen, Oct 3, 2012
    #8
  9. Oct 11, 2012 at 10:33 AM
    #9
    TACO671

    #9
    TACO671 Member

    Joined:
    Jan 11, 2012
    Member:
    #70430
    Messages:
    12
    Gender:
    Male
    SPOKANE
    Vehicle:
    2002 TACOMA SR5 3.4V6
    Change out my front O2 sensor last week. It was pretty easy. Check engine light is now off. I got my DENSO 02 sensor from AMAZON for about $103.00.
     
    TACO671, Oct 11, 2012
    #9
  10. Oct 11, 2012 at 10:43 AM
    #10
    DitchDoc

    #10
    DitchDoc Well-Known Member

    Joined:
    Sep 25, 2012
    Member:
    #87674
    Messages:
    89
    Gender:
    Male
    First Name:
    Logan
    Western North Carolina
    Vehicle:
    03 V6 QC TRD Limited 4x4
    2003 DC 4x4 TRD Cap K&N FIPK
    Glad to hear ya gotter fixed. I need to do mine. It is getting on my nerves.
     
    DitchDoc, Oct 11, 2012
    #10
  11. Oct 11, 2012 at 10:48 AM
    #11
    dtopgun515

    #11
    dtopgun515 Well-Known Member

    Joined:
    Feb 21, 2012
    Member:
    #73285
    Messages:
    1,114
    Gender:
    Male
    First Name:
    Darrell
    Hey Yall Georgia
    Vehicle:
    13 TRD Sport
    5100's up front set to 1.75, SCS Stealth 6 wheels, Nitto Terra Grappler AT's
    When I look up the Denso it's coming up around 40 bucks? How do I know its the right one though it doesn't ask for motor type on Amazon or are they all the same?
     
    dtopgun515, Oct 11, 2012
    #11
  12. Oct 11, 2012 at 10:57 AM
    #12
    asus611

    #12
    asus611 Well-Known Member

    Joined:
    Jan 22, 2010
    Member:
    #29821
    Messages:
    254
    Gender:
    Male
    CA
    Vehicle:
    03 Double Cab Prerunner
    I'm 90% sure that 2002 (V6, 3.4L) and later all use Denso part #
    $149 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles
    234-9001, which is an air fuel ratio sensor, which is also more expensive, which is what the posters above are talking about.

    I think for 2001, depending on if your car is Cali-spec for emissions or not, you may need a different one, which is significantly cheaper, which is probably what came up for you on Amazon. Double check your truck for which emissions package you have.
     
    asus611, Oct 11, 2012
    #12
  13. Oct 11, 2012 at 11:05 AM
    #13
    98tacoma27

    #13
    98tacoma27 is going full "SANDWICH" Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    67,858
    Gender:
    Male
    First Name:
    Ben
    Not Beech Creek
    Vehicle:
    05 Tundra SR5 (+295k AND COUNTING), 2006 F350 King Ranch 6.0L
    Some stuff. Not a lot, just some.
    2001 and 02 auto trans 3.4 take the 9001. 2000 and previous are the years that had the 500 different sensors available for the O2/AFR for Cali and Federal emissions vehicles.
     
    98tacoma27, Oct 11, 2012
    #13
  14. Oct 11, 2012 at 2:37 PM
    #14
    TACO671

    #14
    TACO671 Member

    Joined:
    Jan 11, 2012
    Member:
    #70430
    Messages:
    12
    Gender:
    Male
    SPOKANE
    Vehicle:
    2002 TACOMA SR5 3.4V6
    I saw what type of Tacoma you own on your profile and looked it up on Amazon parts finder and this is what I found. Hope this helps.
    $149 Denso 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles
    http://www.amazon.com/Denso-234-900...qid=1349991111&sr=1-1&keywords=denso+234-9001
     
    TACO671, Oct 11, 2012
    #14
  15. Oct 12, 2012 at 4:54 AM
    #15
    dtopgun515

    #15
    dtopgun515 Well-Known Member

    Joined:
    Feb 21, 2012
    Member:
    #73285
    Messages:
    1,114
    Gender:
    Male
    First Name:
    Darrell
    Hey Yall Georgia
    Vehicle:
    13 TRD Sport
    5100's up front set to 1.75, SCS Stealth 6 wheels, Nitto Terra Grappler AT's
    That makes more sense now! So if I want to replace the O2 sensor as well as the air fuel sensor then the O2 one I saw must of been the cheaper one. Thanks,
     
    dtopgun515, Oct 12, 2012
    #15
  16. Oct 12, 2012 at 8:12 AM
    #16
    Ricky B

    #16
    Ricky B Well-Known Member

    Joined:
    Jun 25, 2008
    Member:
    #7551
    Messages:
    451
    Arkansas
    Vehicle:
    1998 XCAB
    And you know this by it throwing a code???? If so what is code? Rick
     
    Ricky B, Oct 12, 2012
    #16
  17. Oct 12, 2012 at 8:22 AM
    #17
    ETaco23

    #17
    ETaco23 Marshall offroad Fabrication

    Joined:
    Feb 2, 2008
    Member:
    #4544
    Messages:
    5,508
    Gender:
    Male
    First Name:
    Evan
    PNW
    Vehicle:
    13' Pyrite Mica TRD Offroad DCSB 4x4
    Color Match Grille, Bed mat, Kings with JBA UCA's, Dakars and 34" BFG KM3, Snugtop Canopy, and my "Marshall Fabrication" Rock Sliders.
    All first gen Tacoma's (96-04) have only 2 o2 sensors. And they sorrta work together to keep your truck running smooth and good.
    Front one is basically your AFR sensor (Air Fuel Ratio) and if that sensor goes bad it can cause your truck to run rich and you can loose MPG and sometimes run rough. I had all these symptoms on my 02 Taco.
    And these symptoms cause my rear o2 sensor to go bad... So its always best to just replace them both at the same time.
    And the rear o2 just moniters the cats.

    GL :)
     
    ETaco23, Oct 12, 2012
    #17
  18. Oct 12, 2012 at 9:25 AM
    #18
    dtopgun515

    #18
    dtopgun515 Well-Known Member

    Joined:
    Feb 21, 2012
    Member:
    #73285
    Messages:
    1,114
    Gender:
    Male
    First Name:
    Darrell
    Hey Yall Georgia
    Vehicle:
    13 TRD Sport
    5100's up front set to 1.75, SCS Stealth 6 wheels, Nitto Terra Grappler AT's
    Mine threw the P0420 code, print out from AutoZone says

    Definition
    1) Catalyst system efficiency below threshold - bank 1 Probable cause
    2) Air leak in exhaust before rear H02S (Heated Oxygen sensor) Bank 1
    3) AF sensor error
    4) Fuel system fault
    5) Faulty catalytic converter

    I figure I'll just start with the AF and 02 sensor and then go from there if i'm still having an issue. My truck has almost 160,000 miles so it won't hurt to do a little preventive maintenance even if that isn't my problem. Next thing i'll prob check is for any exhaust leaks, last thing would be the catalytic converer.
     
    dtopgun515, Oct 12, 2012
    #18
  19. Oct 12, 2012 at 9:34 AM
    #19
    TACO671

    #19
    TACO671 Member

    Joined:
    Jan 11, 2012
    Member:
    #70430
    Messages:
    12
    Gender:
    Male
    SPOKANE
    Vehicle:
    2002 TACOMA SR5 3.4V6
    You're welcome.. Sorry, to confuse you on my first post. I saw I typed O2 sensor instead of Air/Fuel sensor for the front. So, if you get a error Code I believe it was P1135 that will be for the Air Fuel sensor.
     
    TACO671, Oct 12, 2012
    #19
  20. Oct 12, 2012 at 9:35 PM
    #20
    BamaToy1997

    #20
    BamaToy1997 Wheel Bearing Master

    Joined:
    Jan 31, 2012
    Member:
    #71846
    Messages:
    10,791
    Gender:
    Male
    First Name:
    Bill
    Navarre, FL
    Vehicle:
    1997 Tacoma 4X4 AKA "Blue Beast"
    best wheel bearings around! www.marionbumper2bumper.com
    Even though it is called an "air fuel sensor", it is still an oxygen sensor. They both do the same job: Measuring oxygen content in the exhaust stream for engine management. Just a little FYI.
     
    BamaToy1997, Oct 12, 2012
    #20
Page 1 of 2

Products Discussed in

Denso 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles
$148.69
Denso 234-4206 Oxygen Sensor
$58.37
To Top