Conditions For Setting DTC

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. 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.