Global OBDII
Pathfinder 2001
Non OBD Freeze Frame

Frame 1 Mod $10
TROUB CODE P0171
ENG SPEED RPM 2187
CALC LOAD % 40.7
COOLANT �F 176
ST FTRM1 % 0.0
LT FTRM1 % 33.5
ST FTRM2 % 25.0
LT FTRM2 % 33.5
ST FTRM3 % -100.6
LT FTRM3 % -100.6
LT FTRM4 % -100.6
ST FTRM4 % -100.6
VEH SPEED MPH 60
FUEL SYS 1 OPEN2
FUEL SYS 2 CLSD

Have been getting constant lean codes. Mechanic could not find any vacuum leaks. New 02 sensors, fuel filter and air filter. Before I throw more parts at the problem, could someone find any clues in this freeze frame?

I have never seen freeze frame data that included banks 3 and 4, especially when your vehicle only has two. Did you change the correct 02 sensor? Did you roll with a factory one? If not I would check there.