The transmission in your Navigator is a ZF 6-speed(german transmission company) and the PRNDL sensor is internal.The transmission should not have to be removed to service the part , but the valve body of the transmission will need to be and this is not a job for a novice.The truck will need to be towed to a dealer or capable repair shop and have the switch diagnosed and a repair preformed.Good Luck!
SOURCE: Turn signals on 2003 lincoln Navigator Not working
does it work only one side or does not work at all? if neither side work then first try to check the fuse.
check the emergency lights to see if they are working, if not then check the flasher under the dash.
if the flasher work then it could be your multi-function switch.
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