Set Condition

WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

Code P0171 will set when the following conditions are present.

Codes P0101, P0117, P0118, P0122, P0123, P0134, P0501 and P0502 are not set.
Engine coolant temperature is between 176°F (80°C) and 230°F (110°C).
Steady throttle less than 91 percent.
Vehicle speed is less than 70 MPH.
On VIN L, engine RPM is between 1000-4000 RPM, or on VIN 1, engine RPM is 0-4000 RPM.
EVAP canister purge duty cycle is less than 80 percent.
Long term fuel trim is greater than 158.
Short term fuel trim is 180.
All conditions exist for more than 25 seconds.