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CEL Code: P0174

Discussion in '2nd Gen. Tacomas (2005-2015)' started by wilsonpj, Oct 18, 2009.

  1. Oct 18, 2009 at 3:14 PM
    #1
    wilsonpj

    wilsonpj [OP] Well-Known Member

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    Pete
    Boulder, CO
    Vehicle:
    2006 DC, SB, Off Road Package
    TRD Cat back exhaust. TRD CAI. All-Pro armor, Brush Guard, LR UCA's, OME 3in lift, 16x8 KMC Enduros and 285x75x16 Goodyear Dura Tracs
    So I have thrown a CEL. CODE P0174 - Engine running lean.

    A couple weeks back I removed the secondary filter. Everything was fine for a few days then the CEL came on. The next day it went off and seemed normal again. Then again today the CEL came back on, took it to Auto Zone and read the code. I'm assuming that the engine is running lean due to the removal of the secondary filter with the increase of air.

    It seems weird that sometimes the light comes on and sometimes it's off. I wonder since I live at almost 6000ft if the altitude has anything to do with it, I also use 85 octane. Could I completely discconnect the battery to get the MAF sensor to re-adjust to the new set up?

    I'm trying not to worry all that much as I have a TRD CAI coming this week.

    What should I do if it is still throwing a CEL after the intake is on. Would that be a warranty issue since it is a Toyota Part?

    Confused...
     
  2. Oct 18, 2009 at 3:17 PM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Try cleaning the MAF
     
  3. Oct 18, 2009 at 3:17 PM
    #3
    jnoley07

    jnoley07 Well-Known Member

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    Tennessee
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    I would try the disconnecting battery trick to reset the code. Leave it disconnected for about 20 minutes and then connect it back up. If the code doesnt come back in the near future, I would say you are clear.
    As to what is causing it, I dont know, could be a combination of all the things you mentioned.
     
  4. Oct 18, 2009 at 3:18 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    What 98tacoma said...and check for vacuum leaks .
     
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