I have had basically a parts cannon blasted at my ranger 2001 2.5l was wondering if someone has any ideas literally anything at this point would help . I feel like it’s hotter than usual but my gauge is saying it’s fine. I’ve checked vacuum leaks I’ve replaced fuel filters pumps iac valves maf sensors I’m at a loss.

side note I also have a power steering leak shooting everywhere 🤷‍♂️

 

P0171 System too Lean (Bank 1)

Bank 1 is the only Bank on a 4cyl

You shouldn't have P0171

This code means STFT or LTFT is above +20%, rich or lean code are about Fuel Injector Open times and the computer's calculations
P0171 would mean the computer is having to open the fuel injectors 20% longer than it had calculated based on other sensors
It only opening them 1.6% longer, which is normal, -5% to +5% is "normal"
When accelerating STFT WILL go up to +20% or more, thats also normal because more fuel NEEDS to be added over the "baseline" calculations

Go for a drive and see what STFT and LTFT show when cruising along at say 45-55mph


You didn't mention O2 sensors
These are THE ONLY sensors that wear out, 12 years or 100k miles and they need to be changed, you have 2 of them
Old O2 WILL set Lean code, "false leans"