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

o2 Sensor Question

Discussion in '1st Gen. Tacomas (1995-2004)' started by WVFC1101, Mar 7, 2012.

  1. Mar 7, 2012 at 9:09 AM
    #1
    WVFC1101

    WVFC1101 [OP] Member

    Joined:
    Mar 1, 2012
    Member:
    #73932
    Messages:
    7
    Gender:
    Male
    First Name:
    Cliff
    Northern VA
    Vehicle:
    02 Tacoma SR5
    Add a leaf rear, 2'' coil spring spacer in front, xd hoss wheels.
    My truck is throwing a code (PO420) I was told it was the Upper sensor. I was wondering if someone could help me find where it is so I can replace it or if there is a more simple solution. I was also wondering if this is a common problem with the 02's. Thanks.
     
  2. Mar 7, 2012 at 9:38 AM
    #2
    Robertgeejr1

    Robertgeejr1 Well-Known Member

    Joined:
    Dec 21, 2011
    Member:
    #69167
    Messages:
    774
    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.
    this
    http://www.4x4wire.com/toyota/4Runner/tech/O2_Sensor/
    http://www.tacomaworld.com/forum/1st-gen-tacomas/142451-rear-o2-sensor-done.html

    just do it by the steps
    order them from rocauto in the offical vendor list AND GET THE DENSCO nothing fancy or $$ for these trucks or they will let you know.
    i would get both so i would not have to get back under there if and when the other one goes out and it will
    get some good bold blaster lube and practice getting under the truck for a few day to looses up the bolts while the parts are coming when its cold give them a blast, drive it and then repeat for several days will save you from a lot of swearing. they can get very rusty!
     
  3. Mar 7, 2012 at 10:08 AM
    #3
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,755
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    That code is actually for the catalytic converter but it can be triggered by numerous things.

    http://www.ncttora.com/fsm/2003/Repair_Manual/03tacoma/di/eg5vzfe/cip0420.pdf

    I would suggest replacing both sensors also.

    And yes, it is common with first gens for the sensor(s) to be replaced but only because they have been i service for a long time now.
     
  4. Mar 7, 2012 at 7:14 PM
    #4
    Jenkinstall

    Jenkinstall Active Member

    Joined:
    Jan 19, 2012
    Member:
    #70996
    Messages:
    31
    Gender:
    Male
    First Name:
    Jennings
    Colimbia, sc
    Vehicle:
    00 SC 4Runner Sport Edition 4wd
    Suspension/Drivetrain: 4wd swapped, E locker in rear with 4.30 gears, tundra 5100 adj. bilstein shocks, Trd coils, ome 891 springs with tundra shocks in back. Addicted offroad front tube bumper with BashFab hoops and stingaaaa, BashFab rear tube bumper, 285/75/16 BFG K02, tacoma wheels, savage offroad trans and t case skids and homemade gas tank skid. Engine: 2nd gen TRD SC, URD 7th, 2.2, TRD T-stat, IK-22 Plugs, TRD boost gauge, AEM wideband, ISR mod, and more to come. Interior: Kenwood marine stereo with Bluetooth
    sensors dont just go bad. something cause it had to go bad either from too much contamination from fuel or coolant or from a weekend warrior with seafoam or lucas. pull it out and check to see how dirty the sensing part is. dont just throw parts at it cause it may not be long before the new one goes out without determining the cause of the failure
     
  5. Mar 7, 2012 at 7:58 PM
    #5
    Robertgeejr1

    Robertgeejr1 Well-Known Member

    Joined:
    Dec 21, 2011
    Member:
    #69167
    Messages:
    774
    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.
    well I am sorry but sometimes they do. they wear out just like anything else on a car over time. I had a 92 Nissan SER put 300,000 on her but at 120,000 miles I bought a socket, had to back then, cleaned it with carb cleaner, friend at Nappa told me this trick, if you car has a funny idle, and it had some carbon on it, well 3 months later at Myrtle Beach on the week of the 4th, it just died..... and i was really stupid i used the car jack to get under the car to fix it myself...and drunk..

    i read this awhile back, its long..
    http://www.ttora.com/wiki/index.php/Oxygen_Sensor_Test
     
  6. Mar 8, 2012 at 5:32 AM
    #6
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,755
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    X2.

    And just looking at it isn't going to tell you squat. Inside the sensor is a small heating coil. 99% of the time that is what fails in the sensor. And cleaning them doesn't help.
     
  7. Mar 8, 2012 at 9:20 AM
    #7
    WVFC1101

    WVFC1101 [OP] Member

    Joined:
    Mar 1, 2012
    Member:
    #73932
    Messages:
    7
    Gender:
    Male
    First Name:
    Cliff
    Northern VA
    Vehicle:
    02 Tacoma SR5
    Add a leaf rear, 2'' coil spring spacer in front, xd hoss wheels.
    Alright, Thanks for all your feedback guys today I am going to get under there and start loosening them with some lube and Im also going to replace both I do believe. I may have another question along the way but thanks again.
     
  8. Mar 8, 2012 at 7:13 PM
    #8
    Robertgeejr1

    Robertgeejr1 Well-Known Member

    Joined:
    Dec 21, 2011
    Member:
    #69167
    Messages:
    774
    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.
    well just ask.
    are you near Winchester VA? or more near the dreaded washington dc
     
  9. Mar 11, 2012 at 8:23 PM
    #9
    WVFC1101

    WVFC1101 [OP] Member

    Joined:
    Mar 1, 2012
    Member:
    #73932
    Messages:
    7
    Gender:
    Male
    First Name:
    Cliff
    Northern VA
    Vehicle:
    02 Tacoma SR5
    Add a leaf rear, 2'' coil spring spacer in front, xd hoss wheels.
    Im far enough away from D.C. thank god and I am kinda close to Winchester. I am in Fauquier, well Warrenton. I am in Winchester pretty often I got a lot of buddies up in Berryville.
     
  10. Mar 11, 2012 at 10:05 PM
    #10
    Robertgeejr1

    Robertgeejr1 Well-Known Member

    Joined:
    Dec 21, 2011
    Member:
    #69167
    Messages:
    774
    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.
    when my uncle was in business, we used to sell to sunbelt rentals, and man i can't count the trips I made that way up 29 and interstate 81 but I always enjoyed countryside! Esp. in the fall.
     
  11. Mar 17, 2012 at 2:52 PM
    #11
    ebayollis

    ebayollis MY DIXIE WRECKED

    Joined:
    Sep 4, 2010
    Member:
    #42709
    Messages:
    103
    Gender:
    Male
    First Name:
    josh
    spruce pine nc
    Vehicle:
    2001 tacoma 4 door 4x4
  12. Mar 18, 2012 at 8:17 AM
    #12
    watacomaguy

    watacomaguy Active Member

    Joined:
    Mar 3, 2012
    Member:
    #74061
    Messages:
    41
    Gender:
    Male
    Washington
    Vehicle:
    2012 4x4
    Oxygen sensors are considered 100K replacement items. So no defects there. I'd do both. Probably go with OEM(Probably Denso) instead of Bosch or NGK. Check Rock Auto once you have the exact part number.
     
To Top