Conditions For Setting DTC

WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Passive Tests

When the AIR pump is commanded ON, the HO2S voltages for the applicable bank sensor is greater than remains 470 mV for 20 seconds, and above 200 mV for 7 seconds, on a warm start.
With the AIR pump commanded OFF, the HO2S voltage for the applicable bank sensor does not toggle above 600 mV for 25 seconds, 7 seconds on a warm start.

Active Tests

A failed or an inconclusive passive test has occurred.
The HO2S voltage remains above 250 mV for three 3 second active tests.
The PCM detects a failed passive test and 2 failed active tests; or the PCM records an inconclusive passive test and 3 active tests.