Carry Out On-Board Diagnostics (KOEO, KOER)
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
After a road test, with the vehicle warm and before disconnecting any connectors, carry out the Quick Test using the diagnostic tool. Refer to the INTRODUCTION - GASOLINE article for diagnosis and testing of the powertrain control system.