One problem related to check engine light on has been reported for the 2004 Lincoln Navigator. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Lincoln Navigator based on all problems reported for the 2004 Navigator.
: the contact stated while driving 70mph on the interstate, the speed decreased to 50mph followed by the illumination of the check engine light. The vehicle was seen by a dealer. The mechanic determined the vacuum module on the engine failed. The engine vacuum module was replaced by the dealer.
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