Conditions For Setting DTC
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
When the AIR pump is commanded ON, during Closed Loop operation and the HO2S voltages do not decrease below 222 mV for 1.5 seconds and Short-Term FT does not change more than a predetermined amount.