HO2S Diagnostic Enable

WARNING: This page is about a different car, the 1997 GMC Pickup and 1997 Chevrolet Pickup. However, it is still accessible from the selected car via links, so may be relevant.

No TP sensor DTCs are set.
No EVAP DTCs are set.
No IAT sensor DTCs are set.
No MAP sensor DTCs are set.
No EGR DTCs are set.
No ECT sensor DTCs are set.
No misfire DTCs are set.
No intrusive test in progress.
No device controls active.
System voltage is greater than or equal to 9 volts.