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

CEL Won't Go Away

Discussion in '1st Gen. Tacomas (1995-2004)' started by jrich44, Sep 21, 2011.

  1. Sep 21, 2011 at 2:00 PM
    #1
    jrich44

    jrich44 [OP] Active Member

    Joined:
    Sep 9, 2011
    Member:
    #63210
    Messages:
    39
    Gender:
    Male
    Vehicle:
    96 Tacoma 2.7L
    I have the P0141 code meaning bad O2 Sensor Bank 1 Sensor 2 (the sensor behind the cat).

    The first thing I did was replace the sensor and reset the computer, but that did not fix it so I sent back the new sensor and got another thinking it was a bad product. That didn't work either, so I checked all the wiring looking for a short and found nothing. Next, I ordered another engine control computer from a junkyard in case the computer wasn't functioning properly, and still nothing.

    The cat was just replaced recently so I don't think that is the problem either. I am out of ideas and any help would be appreciated. Is there a special OBDII scanner that can plug into the computer and test the voltages of the O2 sensors so I can narrow it down?
     
  2. Sep 21, 2011 at 3:02 PM
    #2
    darcfenix

    darcfenix Well-Known Member

    Joined:
    Mar 1, 2011
    Member:
    #52118
    Messages:
    61
    Gender:
    Male
    First Name:
    Jim
    Cincinnati, OH
    Vehicle:
    01 Tacoma Double Cab 4x4 TRD Automatic
    Westin Step Bars (Black), Snugtop XV Topper, UWS Truck Chest, Pyle PLM102 10.2" Active Matrix TFT LCD Car Display, Audiovox 130º Wide Angle Vehicle Rear Observation Camera
    I had the same problem after changing out mine; my father-in-law suggested spraying some carb cleaner in the air intake (just make sure it is safe for your MAF). did it with the motor running and next time i started it, my CEL was gone and hasn't been back.
     
  3. Sep 21, 2011 at 3:09 PM
    #3
    humanoid

    humanoid bite me

    Joined:
    Jun 27, 2007
    Member:
    #1932
    Messages:
    2,744
    Gender:
    Male
    Sunny SoCal
    Vehicle:
    I had a '99 Xtra Cab PreRunner SR5 V6
    Try cleaning your MAF sensor first, but be sure to use MAF cleaner, readily available at any reputable autoparts store. Whatever you do don't use a Q-Tip to clean the MAF sensor wires, if you break them, it'd be a very costly mistake because a new MAF sensor costs well over $200.
     
  4. Sep 21, 2011 at 4:02 PM
    #4
    jrich44

    jrich44 [OP] Active Member

    Joined:
    Sep 9, 2011
    Member:
    #63210
    Messages:
    39
    Gender:
    Male
    Vehicle:
    96 Tacoma 2.7L
    Ok, I'll give that a try. Is it normal for the MAF sensor to cause a bad O2 sensor reading?
     
  5. Sep 21, 2011 at 5:23 PM
    #5
    SRQ TACO

    SRQ TACO "You've Got Red on You"

    Joined:
    May 6, 2009
    Member:
    #16879
    Messages:
    1,443
    Gender:
    Male
    First Name:
    Damon
    Sarasota, Florida
    Vehicle:
    00 RegularCab 5lug
    16'' 5zigen Streetfighters w/ 245/55R16 General Altimax HP's, K&N Filter w/ deckplate mod, Dynomax Super Turbo Muffler with turndown before the axle, 01-04 Tail lights tinted, Dual BMW M3 horns, JVC Headunit, JVC 6.5'' door Speakers, Pioneer Shallow Mount 1000W 12'' Sub, 1000W Amp, Monroe Gasmatics front and rear, 1.5'' Daystar Coil Spacer, JDM Smoked Headlights/Corners,2001 Bench Seat, Led swapped gauge cluster and AC controls, Ignition Light mod with blue led, OEM All weather Floor Mats, LED Dome Light, 6000K DDM Tuning HID's, Street Scene Grille and Valance inserts, Clear bumper lights with the fog light mod and JDM Yellow led's, Window Tint: 25% sides and 5% back, TRD Blue Oil Cap.
    Yes very. Make sure to clean it with sensor approved cleaner. You can get some from radio shack.
     
  6. Sep 21, 2011 at 5:37 PM
    #6
    jrich44

    jrich44 [OP] Active Member

    Joined:
    Sep 9, 2011
    Member:
    #63210
    Messages:
    39
    Gender:
    Male
    Vehicle:
    96 Tacoma 2.7L
    Will a product like this work, CRC Electronic Cleaner, or is there something special for the MAF?

    CRC.jpg
     
  7. Sep 21, 2011 at 5:54 PM
    #7
    SRQ TACO

    SRQ TACO "You've Got Red on You"

    Joined:
    May 6, 2009
    Member:
    #16879
    Messages:
    1,443
    Gender:
    Male
    First Name:
    Damon
    Sarasota, Florida
    Vehicle:
    00 RegularCab 5lug
    16'' 5zigen Streetfighters w/ 245/55R16 General Altimax HP's, K&N Filter w/ deckplate mod, Dynomax Super Turbo Muffler with turndown before the axle, 01-04 Tail lights tinted, Dual BMW M3 horns, JVC Headunit, JVC 6.5'' door Speakers, Pioneer Shallow Mount 1000W 12'' Sub, 1000W Amp, Monroe Gasmatics front and rear, 1.5'' Daystar Coil Spacer, JDM Smoked Headlights/Corners,2001 Bench Seat, Led swapped gauge cluster and AC controls, Ignition Light mod with blue led, OEM All weather Floor Mats, LED Dome Light, 6000K DDM Tuning HID's, Street Scene Grille and Valance inserts, Clear bumper lights with the fog light mod and JDM Yellow led's, Window Tint: 25% sides and 5% back, TRD Blue Oil Cap.
    Yes that will work. They sell that at walmart. Make sure its completely dry before you put it back in. Also might as well clean your air filter.
     
  8. Sep 21, 2011 at 6:40 PM
    #8
    TacoMX

    TacoMX TW's Official anti body-lift pundit

    Joined:
    Aug 24, 2011
    Member:
    #62240
    Messages:
    4,834
    Gender:
    Male
    First Name:
    Jonathan
    Deltona, Florida
    and a heads up, the metal plate on the top face of the maf (part you see when its bolted into the intake) comes off, so dont hold it by the top. I was holding it by the top spraying it down w/ the MAF sensor cleaner when it popped out of the plate and i had to do a juggling act to stop it from falling to the cement...
     
  9. Sep 21, 2011 at 6:56 PM
    #9
    Dmonkey

    Dmonkey Well-Known Member

    Joined:
    May 2, 2008
    Member:
    #6360
    Messages:
    3,350
    Gender:
    Male
    First Name:
    Branden
    NorCal
    Vehicle:
    VZN159L (2002 DC)
    Kyb Shocks... for now
    what brand of sensor did you buy? P0141 is bank 1 in a 3rz btw not 2
     
  10. Sep 22, 2011 at 2:24 PM
    #10
    jrich44

    jrich44 [OP] Active Member

    Joined:
    Sep 9, 2011
    Member:
    #63210
    Messages:
    39
    Gender:
    Male
    Vehicle:
    96 Tacoma 2.7L
    Sorry, I meant Bank 1 Sensor 2.
     
  11. Sep 22, 2011 at 2:29 PM
    #11
    Dmonkey

    Dmonkey Well-Known Member

    Joined:
    May 2, 2008
    Member:
    #6360
    Messages:
    3,350
    Gender:
    Male
    First Name:
    Branden
    NorCal
    Vehicle:
    VZN159L (2002 DC)
    Kyb Shocks... for now
    is it a bosch? cuz those can be a little screwy
     
  12. Sep 22, 2011 at 3:50 PM
    #12
    99yodataco

    99yodataco Little Taco that could

    Joined:
    Feb 18, 2010
    Member:
    #31633
    Messages:
    1,960
    Gender:
    Male
    First Name:
    Chad
    New Mexico, it's just a little bit fresher.
    Vehicle:
    99 taco 2.7l SAS
    Dana 44 front and some other useless things.
    I'm having the same problem with my newly replaced O2 sensor. I had already done the cleaning mentioned above prior to installing new sensor as well as checking wires. :notsure:
     
  13. Sep 22, 2011 at 5:54 PM
    #13
    UndefinedTaco

    UndefinedTaco I'll eat all your food.

    Joined:
    Jul 4, 2011
    Member:
    #59313
    Messages:
    2,026
    Gender:
    Male
    First Name:
    Justin
    Tracy, CA
    Vehicle:
    Toyota
    It's an 89 Toyota Pickup. I got some stuff done to it.. FJ axles going under it soon.
    Don't just clean the sensor...take a ohmmeter/multi meter and check the specs across the pins it states on the FSM. If they aren't within specs, cleaning it won't do much. You'll need a new sensor.

    They do go bad, and they aren't cheap. There like $312 from the dealership..like $180-220 from other places.
    Your better off taking a multimeter to a pick n pull and hoping there is one still there..and getting it.
    Alot cheaper.
     
  14. Sep 23, 2011 at 10:22 AM
    #14
    bicklebok

    bicklebok Well-Known Member

    Joined:
    May 24, 2011
    Member:
    #57154
    Messages:
    215
    Gender:
    Male
    First Name:
    Ronnie
    Montgomery, AL
    Vehicle:
    2000 Xtra Cab 4x4 SR5
    Only use OEM Denso 02 sensors. Go to denso's website and look up the oem fit part number, then buy it from Rockauto or ebay. That's what I did and bought my OEM sensor off ebay for $50. No more CEL.
     
  15. Sep 23, 2011 at 10:28 AM
    #15
    Tacomanator

    Tacomanator Boiling denim and bangin whores

    Joined:
    Jul 25, 2010
    Member:
    #40746
    Messages:
    4,634
    Gender:
    Male
    First Name:
    Clam Slammer
    Southern Cali
    King 2.5" extended travel coilovers with compression adjusters, Camburg UCA's, King 2.5" rear shocks, TRD 1st gen CAI.
    Don't mean to thread jack... My CEL came on a few days ago (first time ever) but turned off a couple days later by itself. Should I still take it in and get it scanned? Or is everything fine now?
     
  16. Sep 23, 2011 at 11:20 AM
    #16
    UndefinedTaco

    UndefinedTaco I'll eat all your food.

    Joined:
    Jul 4, 2011
    Member:
    #59313
    Messages:
    2,026
    Gender:
    Male
    First Name:
    Justin
    Tracy, CA
    Vehicle:
    Toyota
    It's an 89 Toyota Pickup. I got some stuff done to it.. FJ axles going under it soon.
    I'd scan it ^ the code(s) will still be stored in the ECU.

    It could be helpful to check it now, fix something before another problem arises.
     
  17. Sep 23, 2011 at 5:22 PM
    #17
    Tacomanator

    Tacomanator Boiling denim and bangin whores

    Joined:
    Jul 25, 2010
    Member:
    #40746
    Messages:
    4,634
    Gender:
    Male
    First Name:
    Clam Slammer
    Southern Cali
    King 2.5" extended travel coilovers with compression adjusters, Camburg UCA's, King 2.5" rear shocks, TRD 1st gen CAI.
    Cool, thanks. My buddy actually has a nice scanner so i'm gonna have him scan it.
     
  18. Sep 24, 2011 at 7:03 AM
    #18
    jrich44

    jrich44 [OP] Active Member

    Joined:
    Sep 9, 2011
    Member:
    #63210
    Messages:
    39
    Gender:
    Male
    Vehicle:
    96 Tacoma 2.7L
    Well I haven't had a chance to clean the MAF sensor yet, I couldn't get one of the bolts off. But I was looking at the O2 sensor again and noticed that it is a little different style than most others. The owner before me just had a new catalytic converter and exhaust pipe put on as well as a new O2 sensor before I bought the truck. The sensor that was installed is mounted by a nut welded to the exhaust pipe, there is no oval shaped gasket like on most sensors. Is this a problem, or if I order a new Denso sensor to replace it will it still mount correctly without that gasket?
     
  19. Sep 24, 2011 at 10:00 AM
    #19
    TacoMX

    TacoMX TW's Official anti body-lift pundit

    Joined:
    Aug 24, 2011
    Member:
    #62240
    Messages:
    4,834
    Gender:
    Male
    First Name:
    Jonathan
    Deltona, Florida
    so the o2 sensor has a bung that looks like this?: (just an example off google)

    [​IMG]

    if so that is aftermarket. Our taco's o2 sensors bolt on using two studs/nuts.
     
  20. Sep 24, 2011 at 12:46 PM
    #20
    jrich44

    jrich44 [OP] Active Member

    Joined:
    Sep 9, 2011
    Member:
    #63210
    Messages:
    39
    Gender:
    Male
    Vehicle:
    96 Tacoma 2.7L
    Correct, I talked with the guy that did the work and he said he went that route because it was much cheaper than buying an exhaust pipe from Toyota with the bracket. He said he had tested the sensor he installed and it was sending the correct voltages to the computer, but for some reason still turns on the CEL. I think I'll just get a cheap scan tool and scan the computer for any other codes every now and then.
     
To Top