P0053 (2) Chevrolet Uplander I

The ECM detects that the HO2S 1 heater calculated resistance is not within an expected range at engine start-up for one second.

P0135

1. The HO2S heater current is less than 0.31 amps or more than 1.43 amps for at least 17 out of 20 samples. Five test samples during each trip with a 30 second delay between each test.
2. Each test duration is one second.

Action Taken When the DTC Sets

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.