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: Door handle replacement help ISO silver limited fender flares Lockright doesnt fit Rear Shock Bushing Replacement Bed lights. CB mounting?

2002 4x4 3.4l V6 Throwing PO420 CEL Code

Discussion in '1st Gen. Tacomas (1995-2004)' started by n315on, Feb 13, 2011.

Page 2 of 2
  1. Feb 18, 2011 at 6:34 PM
    #21
    Demon Taco

    #21
    Demon Taco Well-Known Member

    Joined:
    Nov 30, 2010
    Member:
    #46924
    Messages:
    91
    Gender:
    Male
    First Name:
    Robert
    New Hampshire
    Vehicle:
    Gold Tacoma SR5 4X4
    the sulfur smell is a direct result from the crap the gas companies cut the fuel with to make more out of less.change gas stations for a few fill ups.the same thing happened to me in my blown mustang gt,i stopped using an off brand gas station and went to a brand name gas station and the smell never came back.have the o2 sensors diagnosed to see if they are lazy or not before you spend money on the parts.they can be watched in real time while vehicle is running through the ecm using a scanner.
     
    Demon Taco, Feb 18, 2011
    #21
  2. Feb 18, 2011 at 6:53 PM
    #22
    SUPMO72

    #22
    SUPMO72 Well-Known Member

    Joined:
    Nov 2, 2008
    Member:
    #10426
    Messages:
    63
    Gender:
    Male
    Cleveland Ohio
    Vehicle:
    09 MGM Reg 4x4 5spd
    OEM Fog Lights, Tailgate Lock, Color matched OEM Grill, GT seat covers, Undercover bed cover, OEM back up camera
    The rear o2 sensor only looks at how well the converter is doing, it makes no adjustments. You prolly have a bad converter. Normally if its something wrong with the rear o2 it will set a p0136 , p0138 depending on the model. If you have use of a scan tool that shows live data look to see if it has movement or if it pegged rich or lean. It should have some movement rich or lean but not as much as the front o2. Hope this helps
     
    SUPMO72, Feb 18, 2011
    #22
  3. Feb 18, 2011 at 7:02 PM
    #23
    meckleystephen

    #23
    meckleystephen My Taco is Bi-Winning!!!!!!!!

    Joined:
    Jan 17, 2010
    Member:
    #29505
    Messages:
    424
    Gender:
    Male
    First Name:
    Stephen
    York, PA
    Vehicle:
    2013 Toyota Tacoma Off Road
    3 Inch Toytec lift,Blacked out badges
    i forget what it was called but on my 96 i had the same problem and i also replaced the 02 sensor and it didnt fix it then when i took it in to the shop for inspection they found a buildup on another sensor under the hood they scraped it off and fixed it instantly i really wish i had more info but that was about 4 years ago maybe this could send you in the right direction good luck
     
    meckleystephen, Feb 18, 2011
    #23
  4. Feb 22, 2011 at 3:22 PM
    #24
    n315on

    #24
    n315on [OP] Well-Known Member

    Joined:
    Feb 8, 2010
    Member:
    #30984
    Messages:
    158
    Gender:
    Male
    First Name:
    Mike
    MA
    Vehicle:
    02 4x4 SR5
    3'' toytec lift springs wrapped around 5100's. Deck plate mod. TRD seat belt pads. JL audio amps /subs and Alpine speakers. Diff breather mod. Working on a custom rear bumper
    Just ordered both the sensors. Total was $189.xx the same cost of the upstream sensor i bought at autozone. Hopefully I can get a refund.
     
    n315on, Feb 22, 2011
    #24
  5. Dec 3, 2012 at 5:41 PM
    #25
    tacomataco2

    #25
    tacomataco2 A dude

    Joined:
    Nov 27, 2012
    Member:
    #91944
    Messages:
    2,216
    Gender:
    Male
    Mass
    Vehicle:
    15’ ACLB
    Some of this Some of that
    Aww man my engine light came on today! po420. looks like i'll be hoping i feel lucky and its just the sensor.... again
     
    tacomataco2, Dec 3, 2012
    #25
  6. Dec 3, 2012 at 5:47 PM
    #26
    Spoonman

    #26
    Spoonman Granite Guru

    Joined:
    Sep 11, 2011
    Member:
    #63328
    Messages:
    9,812
    Gender:
    Male
    First Name:
    Jamie
    Alberta
    That sucks. P0420 is rarely a symptom. There's a very good chance your cats are toast.

    The downstream 02 sensor is your catalyst efficiency sensor. It's only job is to measure catalyst efficiency.
     
    Spoonman, Dec 3, 2012
    #26
  7. Dec 4, 2012 at 3:53 PM
    #27
    tacomataco2

    #27
    tacomataco2 A dude

    Joined:
    Nov 27, 2012
    Member:
    #91944
    Messages:
    2,216
    Gender:
    Male
    Mass
    Vehicle:
    15’ ACLB
    Some of this Some of that
    I wouldn't be surprised they have 215xxx on them.. Wouldn't they be emitting a sulfer-y smell?
     
    tacomataco2, Dec 4, 2012
    #27
  8. Dec 4, 2012 at 5:09 PM
    #28
    ToyoTaco02

    #28
    ToyoTaco02 Well-Known Member

    Joined:
    Jan 21, 2011
    Member:
    #49667
    Messages:
    487
    Gender:
    Male
    First Name:
    Scott
    Decatur,IL
    Vehicle:
    02 PreRunner DC 2.7L
    OME 881 1/4" top plate spacer OME Dakars OME Nitrochargers Light Racing UCA
    I had the same code about 3 months ago. I went to get a quote from the dealer and they wanted $2500!!!! I replaced both sensors instead and code went away.
     
    ToyoTaco02, Dec 4, 2012
    #28
Page 2 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
$136.52
To Top