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.

The lean to rich response, defined as less than 300 mV to more than 600 mV, average time is more than a calibrated amount.
The rich to lean response, defined as more than 600 mV to less than 300 mV, average time is more than a calibrated amount.