The light just came on last night.......not the check engine light
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2004 Lincoln Navigator Question: wat should I do and expect now that my emissions system light came on
Answer #1dandd August 11, 2011, 11:58Master
Emissions System light is the same as the check engine light, service engine soon light etc. Many names for the same thing. It takes about 1 hour to determine what the code or codes mean and what the issue is, then you go from there. It can be anything from a bad cat converter ( expensive ) to a worn out gas cap.
here are some shops: