P0171 Code on a 2001 2.3. PCV valve? O2s? Help!
I got a P0171 (Engine too lean (bank 1)) on a 2.3L 2001 Ranger. Replaced the airfilter, cleaned the MAF sensor with tuner cleaner, light comes back. been driving for a couple weeks, but i'd like to get it cleared up. truck is stock in every way.
anyone had the problem? I'm thinking PCV valve perhaps, or maybe O2 sensors? doubt its EGR...
Any help/experience would be appreciated.
thanks in advance!