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.
Engine has been running for more than 120 seconds.
Ignition voltage is between 11-18 volts.
Bank 1 HO2S No. 2 voltage does not change more than 150 millivolts from bias voltage (between 400 and 500 millivolts) for a longer amount of time than necessary. Maximum time required to reach operating range is 120 seconds. This warm up time depends on engine coolant temperature at time of start-up and total air flow since last start-up.