Carry Out On-Board Diagnostics Key ON Engine OFF (KOEO), Key ON Engine Running (KOER)
WARNING: This page is about a different car, the 2009 Ford Mustang. 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 a suitable diagnostic scan tool. Refer to the Introduction - Gasoline Engines for diagnosis and testing of the powertrain control system.