Condition for Running the DTC

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The engine coolant temperature (ECT) is more than 70°C (158°F).
The engine is running at steady speed.
The engine is operating in Closed Loop.
DTC P0171 runs continuously once the above conditions have been met.