October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Code Enable Criteria

Engine run time is greater than one minute.
No CMP, CKP, ECT, EGR, EVAP purge solenoid, fuel trim, IAT, MAP, misfire, system voltage, or TP sensor DTCs are set.

DTC sets when O2S1 voltage is inactive (not reading outside 391-491 millivolts) for greater than 90 seconds.