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.

Airflow is less than 22 grams/second.
Engine load is less than 33.25 percent.
Air/fuel ratio is 13.125:1.
Engine speed is more than 900 RPM.
Engine Coolant Temperature (ECT) is 158-230°F (70-110°C).
System voltage is more than 11.7 volts.
DTCs P0137, P0138 P0140, P0141, P0143, P0144, P0146, P0147, P0151-P0155, P0157, P0158, P0160, P0161, P0171, P0172, P0174, P0175, P0300, P0500, P1106, P1107, P1111, P1112, P1114, P1115, P1121, P1122, P1133, P1134, P1153, P1154, P1351, or P1361 are not set.

DTC sets when HO2S voltage is less than 222 millivolts for more than one second when AIR pump is turned on during closed loop operation.