Test Description
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 2 - HO2S 2 should be allowed to cool before performing this test. HO2S 2 is cool enough if voltage output is stable at bias or about 450 mV. If HO2S 2 heater is functioning, signal voltage will gradually change as sensor element warms. If heater is not functioning, HO2S 2 signal will remain near 450 mV bias voltage or show very little activity.
- 4 - This step ensures that ignition voltage circuit to HO2S 2 is not open or shorted. Test light must be connected to a good ground, independent of HO2S system.
- 6 - This test must not be performed until HO2S 2 heater has cooled and stabilized for at least 15 minutes. Heater resistance is typically about 5 ohms at room temperature.