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 run time is more than 5 seconds.
Engine coolant temperature is above 140°F (60°C).
HO2S heater is operating properly.
Bank 2 HO2S No. 1 signal voltage remains between 400 and 500 millivolts for a total of 77 seconds over a 90-second period.