03 Highlander P0171 & P0174 - Toyota Nation Forum : Toyota Car and Truck Forums


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1st Generation (2001-2007) Forum dedicated to the discussion of 1st generation Toyota Highlanders.

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Old 05-27-2009, 05:05 PM   #1 (permalink)
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Question 03 Highlander P0171 & P0174

Hello everyone. I have an 03 Highlander with these two codes (P0171 & P0174 sysytem lean). It does not want to start unless I spray carb clean in the throttle body. It stays running after that (I haven't tried take it on the road). I was told to replace the fuel filter but I see some comments in the forums that say these fuel filters never go bad. Any suggestions?
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Old 05-28-2009, 08:20 PM   #2 (permalink)
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These codes according to the toyota repair manual are "system too rich". It sounds like your "Intake Idle Air Control Valve". After years of running these can get carboned up. You can try to remove the IIACV and clean it with carb and choke cleaner then reinstall it. This has been known to fix it. If it doesn't you will needs to replace the unit. My 02 had a problem of not starting and uneven ideling, I could get it to start by pumping the pedal. I cleaned the unit and it is working perfectly a year later. Hope this helps. If it does just go to Auto Zone or Advance Auto and they can delete the codes once you fix the issue for free.

Last edited by Recovery; 05-28-2009 at 08:24 PM.
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Old 05-28-2009, 09:09 PM   #3 (permalink)
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Also check the 2 wires down in the MAF sensor for dirt build-up etc...
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Old 05-29-2009, 08:33 AM   #4 (permalink)
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My 2002 had this problem, 2 air/fuel ratio sensors and a new o2 sensor solved the problem.
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