Code Enable Criteria

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.

Following conditions must be met for DTC diagnostic test to run:

No related DTCs.
Battery voltage is 10 volts or more.
Engine coolant temperature is more than 140°F (60°C).
Engine run time is more than 5 seconds.
HO2S heater is operating properly.
Vehicle is operating in closed loop.
Bank 2 HO2S No. 2 signal voltage remains between 426 and 474 millivolts for a total of 106 seconds over a 125-second period.