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P0171 code help needed

Discussion in 'Technical Chat' started by crazyscout, Jun 24, 2010.

  1. Jun 24, 2010 at 5:43 PM
    #1
    crazyscout

    crazyscout [OP] Member

    Joined:
    Jun 17, 2010
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    Male
    Texas
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    02 PreRunner SR5
    So my check engine light came on. I had replaced o-rings on 2 fuel injectors and it was working fine. Drove 2 hours to a party, sat there for a few hours, then drove back. It came on as soon as I got home. I changed the spark plugs the next day, I was going to anyway, and it went off for a while. Since then, I've cleaned the MAF sensor, inspected the intake system for cracks or leaks, reset the ECM, and run through a full tank of gas with fuel injector cleaner....any suggestions what to try before I start replacing sensors? I was told it could be the coolant temperature sensor, O2 sensor, MAF sensor, or the MAP sensor. If there's nothing else to try I'm going to go through and test, then replace them in that order
     
  2. Jun 25, 2010 at 6:51 AM
    #2
    BlueT

    BlueT Well-Known Member

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    07 Dbl Cab LB with LSD
    I moded 1999 Taco so much it had turned to Land Cruiser
    Check PCV valve and the PCV rubber line for it for cracks, stuck open etc..
     
  3. Jun 25, 2010 at 7:29 AM
    #3
    OCTaco

    OCTaco Well-Known Member

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