1997 - 2003 F-150

codes p0171 and p0174

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Old Apr 18, 2014 | 02:27 PM
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railer5516's Avatar
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codes p0171 and p0174

i have a 2003 f-150 with the 5.4L engine in it and it is showing the p0171 and p0174 codes i jus cleaned the MAF sensor and changed the air filter what else could it possibly be?
 
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Old Apr 18, 2014 | 03:27 PM
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glc
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From: Joplin MO
Vacuum leak or air entering the intake tube after the MAF. Most common vacuum leak is the PCV elbow behind the throttle body.
 
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