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Thrown PO171 code help

Discussion in '1st Gen. Tacomas (1995-2004)' started by Phearson, Apr 26, 2012.

  1. Apr 26, 2012 at 4:15 PM
    #1
    Phearson

    Phearson [OP] Taco or Die

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    Brad
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    So im getting a po171 and a PO420. PO420 is the cat going bad.. but the PO171 is to lean. Now my question is is it lean because of a MAF or an 02 sensor? ORR injectors? I didnt get a direct problem so im kinda up to guess.

    On another topic i might just throw a test pipe in but how could i bypass an 02 sensor or will i have to live with the CELL on always?
     
  2. Apr 27, 2012 at 12:17 AM
    #2
    SCSPerformance

    SCSPerformance Stealth Custom Series™ Vendor

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    i would try cleaning the MAF first with the proper maf cleaner. i had the p0171 code a while back and cleaning the maf helped.
     
  3. Apr 27, 2012 at 5:08 AM
    #3
    theGastone

    theGastone New vehicle/Tacoma *****

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    You may not actually have the P0420, but that it's being caused by the P0171. My check engine light has the P0171 on and I've found where the sensor is etc. But it's not that important of a fix for me, so I just reset the codes for now. You may just have to replace the bank 1 sensor to fix both problems.
     
  4. Jun 4, 2012 at 8:54 PM
    #4
    JakeInGrayTacoma

    JakeInGrayTacoma Active Member

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    Get back up to snuff cuz it wasn't maintained. I got xm radio in it.
    Where is the bank 1 sensor? I got a P0170 reading this afternoon when I hooked up the obd2 to my truck. Discovered it was the "fuel trim bank 1" all hoses are connected, and I sprayed out the MAF sensor. What do I do to get the check engine lite off?
     
  5. Jun 5, 2012 at 7:03 AM
    #5
    goomba

    goomba It is a Fluid Situation

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  6. Jun 5, 2012 at 11:25 AM
    #6
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    That sensor is in front of the cat on the driver's side in the exhaust pipe.
     
  7. Jun 5, 2012 at 11:29 AM
    #7
    MapleMoose

    MapleMoose Drunk Canadian

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    So ive had the P0171 "system too lean" code for a long time now. Ive cleaned the maf several times, changed air filter, cleaned throttle body and still showing the code. I replaced both o2 sensors last year. Could the pre-cat o2 have gotten fouled? Can you clean the o2 sensors with a sensor clean?
     
  8. Jun 5, 2012 at 11:33 AM
    #8
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It could be any of these...
    • Air intake (hose loose)
    • Fuel line pressure
    • Injector blockage
    • Heated oxygen sensor malfunction
    • Mass air flow meter
    • Engine coolant temp. sensor
     
  9. Jun 5, 2012 at 11:39 AM
    #9
    MapleMoose

    MapleMoose Drunk Canadian

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  10. Jun 5, 2012 at 11:42 AM
    #10
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    They forgot to mention exhaust leak too.
     
  11. Jun 5, 2012 at 11:49 AM
    #11
    medic2230

    medic2230 Ditch Doctor

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    When the 99 4runner did it toyota started with the MAF sensor and got it. The tech had been working on toyota's for 30 years. He said that was it before he looked at it. Runner threw the same code. YMMV
     
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