What is my OBD2 reader telling me?

Question

Toyota Camry 2.? LTR 4 cylinder

P0171 System too lean
(bank 1)
Fuel Sys 2 C/L fault

Calc Load (%) 28.24
ECT (degrees F) 185
STFT B1 (%) 4.69

Answer 1

try to clean the mass air flow sensor with mass air flow sensor cleaner, also check for an intake leaks

you can also check fuel pressure which should be 44-50 PSI at idle