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CEL and Trac Off Lights

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Dumneezooo, Dec 22, 2021.

  1. Dec 22, 2021 at 4:20 PM
    #1
    Dumneezooo

    Dumneezooo [OP] Well-Known Member

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    Hey folks,

    For the past 3-4 weeks my CEL and Trac lights have been coming on and off. I took it to AutoZone and the code came back as oxygen. I bought a new gas cap from Napa and put it on today but as of now the lights are still on. Could one of you mechanic genius help me out with the next steps? Not sure how serious this is nor how to fix it
     
  2. Dec 22, 2021 at 4:25 PM
    #2
    Geeves77

    Geeves77 Well-Known Member

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    That word “oxygen” seems pretty vague, did they give you a code number? That could mean oxygen sensor, it could be quite a few things
     
    Dumneezooo[OP] likes this.
  3. Dec 22, 2021 at 4:33 PM
    #3
    Dumneezooo

    Dumneezooo [OP] Well-Known Member

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    Thanks - heading to AutoZone now I'll report back shortly with more details
     
  4. Dec 22, 2021 at 4:35 PM
    #4
    Superdave1.0

    Superdave1.0 Grandma Dave

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    By the time you make 10 trips to Autozone getting the code read for free, you could spend that $50 gas money on your own code reader. Just a thought.
     
  5. Dec 22, 2021 at 4:51 PM
    #5
    Dumneezooo

    Dumneezooo [OP] Well-Known Member

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    Yes sir - it's oxygen sensor. Im assuming this requires a visit to the mechanic?
     
  6. Dec 22, 2021 at 4:56 PM
    #6
    Superdave1.0

    Superdave1.0 Grandma Dave

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    They are pretty easy to replace. If you can change your own oil, could change out an O2 sensor. Your truck likely has 4 of them. 2 upstream, 2 downstream.
     
  7. Dec 22, 2021 at 4:58 PM
    #7
    Dumneezooo

    Dumneezooo [OP] Well-Known Member

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    Perfect. Thank you I'll dig into this DIY
     
  8. Dec 22, 2021 at 5:04 PM
    #8
    Dm93

    Dm93 Test Don't Guess

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    You need the code number to know what your actual problem is, you have 4 oxygen sensors if you have a v6 and 2 if you have a 4cyl.
     
  9. Dec 22, 2021 at 5:09 PM
    #9
    Dumneezooo

    Dumneezooo [OP] Well-Known Member

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    P0174 V6
     
  10. Dec 22, 2021 at 5:13 PM
    #10
    Superdave1.0

    Superdave1.0 Grandma Dave

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    Not saying this is your problem. Just what I found upon a quick search:


    Causes
    Here are the most common causes of P0171 + P0174. Vacuum leaks (particularly at the intake manifold) and the MAF sensor are the most common culprits.
     
  11. Dec 22, 2021 at 5:15 PM
    #11
    Dm93

    Dm93 Test Don't Guess

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    P0174 is a lean code (not enough fuel/too much air) for bank 2 (drivers side) it's likely not an oxygen sensor problem although that is a possibility, if there's no obvious exhaust leaks or leaks in the air intake system you really need a scan tool to monitor fuel trims and oxygen sensor data to diagnose it.
     
  12. Dec 22, 2021 at 5:15 PM
    #12
    Dumneezooo

    Dumneezooo [OP] Well-Known Member

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    Appreciate it man. Will try this first tomorrow then move on to O2 sensor
     
  13. Dec 23, 2021 at 11:28 AM
    #13
    Dumneezooo

    Dumneezooo [OP] Well-Known Member

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    Update - lights were off this morning but I cleaned out MAF and O2 sensors. Also checked all tubes everything looks okay. Will check back in if lights come on again soon and an update from a more intensive inspection/repair
     

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