Diagnostic Strategy: Diagnostics

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Carry out On-Board Diagnostic (OBD) procedures, Key ON Engine OFF (KOEO) and Key ON Engine Running (KOER).
Record all DTCs.
Repair all non-transmission codes first.
Repair all transmission codes second.
Clear all continuous codes and attempt to repeat them.
Repair all continuous codes.
If only codes that have passed are obtained, refer to Diagnosis By Symptom .

Follow the diagnostic sequence to diagnose and repair the concern the first time.