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cel code help

Discussion in '1st Gen. Tacomas (1995-2004)' started by DaytonLax14, Apr 18, 2011.

  1. Apr 18, 2011 at 6:21 PM
    #1
    DaytonLax14

    DaytonLax14 [OP] Well-Known Member

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    got my cel checked at autozone and this is the code: P0171. Help?
     
  2. Apr 18, 2011 at 6:41 PM
    #2
    Murrfk

    Murrfk Well-Known Member

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    It means your google search is malfunctioning!

    j/k System too lean is what I get. O2 sensor needs replacement?

    Here is what the manual says:

    *Air intake (hose loose)
    • Fuel line pressure
    • Injector blockage 0 0 (EG-230) (Fuel Trim)
    • Heated oxygen sensor malfunction
    • Mass air flow meter
    • Engine coolant temp. sensor
     
  3. Apr 18, 2011 at 6:44 PM
    #3
    DaytonLax14

    DaytonLax14 [OP] Well-Known Member

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    okay gotcha. would i need to replace the upstream or downstream sensor?
     
  4. Apr 18, 2011 at 6:51 PM
    #4
    MapleMoose

    MapleMoose Drunk Canadian

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    I have the exact same code and i just recently replaced both o2 sensors! I got the p0121 code i think. It said to replace them both and i did. CEL went away for several months. Then i went mudding and got stuck in a water pit and the water was up to the floor.
    Could it really be the sensors?? And could it be just one? I really hope i dont have to replace both.
     
  5. Apr 19, 2011 at 7:19 AM
    #5
    skytower

    skytower Well-Known Member

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    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    Make sure there are no leaks in your vac lines. Unmetered air after the MAF will make the engine run lean/rough.
     
  6. Apr 19, 2011 at 8:12 AM
    #6
    DblCabMN

    DblCabMN Well-Known Member

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    Cheapest starting point: Clean your MAF. Takes about 2 minutes.
    Reset your CEL and see if it comes back on.
     
  7. Apr 19, 2011 at 10:40 AM
    #7
    BBJ285

    BBJ285 Well-Known Member

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    SnugTop cap, "SuperSpring" helperspring, flowmaster muff,K&N CAI, CB, small amp & 2 6x9s in the bed on a toggles switch for nights at the drive-in...
    will usually be the upstream(front) sensor.
     
  8. Apr 19, 2011 at 10:41 AM
    #8
    Matic

    Matic Locked and Lifted "02" DC TRD.

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    keep an eye on your mpg.
    I think the upstream in bank? causes severe loss.
     
  9. Apr 19, 2011 at 11:23 AM
    #9
    bellassaiw10

    bellassaiw10 Formally afroman5015

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    I second the MAF cleaning had the same cel code on for 2 years replaced both sensors and it came back on 20 mins later, cleaned the MAF a month ago and hasnt been on since
     
  10. Apr 19, 2011 at 11:28 AM
    #10
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    *3rd's the motion
     
  11. Apr 19, 2011 at 12:11 PM
    #11
    MapleMoose

    MapleMoose Drunk Canadian

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    Thanks everyone for the help! This will save a trip to the stealership. Rep for all!!!!
     
  12. Apr 19, 2011 at 6:21 PM
    #12
    DaytonLax14

    DaytonLax14 [OP] Well-Known Member

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    cleaned the maf and reset the code and the good ol cel came back on
     
  13. Apr 20, 2011 at 5:44 AM
    #13
    DblCabMN

    DblCabMN Well-Known Member

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    :lalala:


    Running lean? So (correct me if i'm wrong) You look at either a low fuel pressure/insufficient flow or an electronic giving your computer bad info... Fuel filters are what, $20? Whens the last time yours was changed? When's the last time you checked for vacuum leaks? (re:skytower) It's cheaper than replacing the front O2 again.

    Also, long shot - but after cleaning and resetting the code did you also unplug battery for 10-20minutes and 'hit the brake a few times' to reset the comp? - The old 'incorrect' a/f rate could be stuck in there and throwing code before it polls the MAF/1st O2 for an updated reading.

    My old (70's) Honda parallel twins run like shit when they even think they're not sealed up right. (CV Carbs... so kinda need that Vac pressure)

    <-i'm all about checking for the cheapest/easiest before shelling out more than 50$ unless it can be very well narrowed down to just that 1 expensive part.

    Check for leaks/make sure you're resetting fully.
     
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