Code Enable Criteria

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Engine Coolant Temperature (ECT) sensor is more than 135°F (57°C).
Engine run time is more than 160 seconds.
Mass Airflow (MAF) sensor is 15-55 grams/second.
Engine speed is 1100-3000 RPM.
Throttle Position (TP) sensor is more than 5 percent.
System is in closed loop.
Ignition 1 signal is 9-18 volts.
Fuel tank level remaining is more than 10 percent.
Intrusive tests are not in progress.
Scan tool output controls are not active.
DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0134, P0135, P0151, P0152, P0154, P0155, P0300, P0351, P0401, P0404, P0405, P0440, P0442, P0446, P0452, P0453, P1258, P1404, or P1441 are not set.
Conditions are met for 100 seconds.

DTC sets when rich-to-lean and lean-to-rich average response time is more than a calibrated value.