Question

I have a 1999 Ford F250 5.4L repair solutions for codes p0171 & p0174?

Answer 1

Hi there,

The most common cause when you have both codes together is either a bad mass air flow sensor or low fuel pressure. Most common however is the maf sensor.

Answer 2

P0171 FORD - Fuel Injection System Too Lean Bank 1
Read more: https://www.autocodes.com/p0171_ford.html

P0174 FORD - Fuel Injection System Too Lean Bank 2
Read more: https://www.autocodes.com/p0174_ford.html