Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step number in the diagnostic procedures.

2

Check HO2S heater current with engine at operating temperature and allow time for heater current to stabilize. The HO2S heater current is initially higher until the sensor reaches the full operating temperature.

4

This ensures that ignition 1 voltage circuit to HO2S is not open or shorted. The test light should be connected to a good chassis ground in case the HO2S low reference or HO2S heater low control circuit is malfunctioning.

5

This checks HO2S heater low control circuit. The engine must be running for PCM to enable heater.

6

This checks for a short to voltage in the HO2S heater control circuit.