This past weekend my MIL came on. I plugged in my OBDII and got a P0171 malfunction code. System Lean Bank 1.
97 F150 SC 4x4 OR
Gibson catback dual exhaust
My first thought was the MAF is dirty but wouldnt both banks registered this error code?
What side is Bank 1, Driver?
Could this be an O2s? Isnt that a seperate error code?
Possibly a leaking intake manifold gasket?
Ive checked for vacuum leaks and havent found anything.
The code hasnt returned since I cleared it.
Thanks for any ideas.