Conditions For Running DTC

WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0131, P0132, P0133, P0134, or P1133 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.