Tip & How-To about Ford Expedition
The flashing OD light indicates there is a problem in the transmission control system. When the Transmission Control Unit detects a malfunction it will flash the OD light and store a Diagnostic Trouble Code (DTC) in the computer. You will need to have a Ford Dealer pull the codes and determine exactly what is wrong.I wish I could be more specific, but there are about 120 different reasons for the flashing OD light.
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