Conditions For Running DTC

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0122, P0123, P0131, P0132, P0133, or P0134 are not set.
The Engine Coolant Temperature (ECT) is more than 70°F (20°C).
The engine has been running for longer than 20 seconds.
The engine is operating in a Closed Loop operation.
The engine is in the power enrichment mode.