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P0174 code detected but car run very normal

Tiny
TRI VISH
  • MEMBER
  • 2003 TOYOTA AVALON
  • 126,000 MILES
Based on the details that I have provided what else could go wrong. I had the P0174 and P0171 code and cleaned MAF sensor and changed the Air filter. Subsequently code came back as P0174. Tapped on MAF and engine runs normal. PCV valve is good.

Vacuum hoses seem to be good. No hissing.
A/F Bank1 Sensor1 changed and injector/Throttle cleaned by dealer 4 months ago. Platinum sparkplugs changed a year ago by dealer. I am wondering what else can go wrong? Appreciate your answer.
Thanks
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Friday, March 30th, 2012 AT 7:25 PM

1 Reply

Tiny
DJCL
  • MECHANIC
  • 767 POSTS
Drive the car with a scanner on it watch yourcalcuted load reading under full throttle wot it should go to 85% or better . If it can't replace the air flow meter

Go here for more info

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers
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Friday, March 30th, 2012 AT 8:42 PM

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