KOEO & KOER On-Demand Self-Test Codes
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Record DTCs in order received. These DTCs indicate current faults in system and should be serviced in order of appearance. See DIAGNOSTIC TROUBLE CODE DEFINITIONS to identify appropriate system test to perform.