The check engine muted flashes resembling 40 times and later go sour lincoln navigator?

it is a 1998 lincoln navigator just just now started to miss I that it was the spark plugs because I havent replace it since investigational (190000) later I translate the spark plugs any ways it did't make a difference so I check adjectives the coils ,..nathing now i don't know what to do, may be the chain harness ? please help!!

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Answers:    If your check engine neutral flashes PULL OVER AND SHUT THE ENGINE OFF!!! The light will flash when your catalytic converter is overheating to prevent you from ruining it. The converter is overheating because you are missfiring and dumping unburned gas through the catalytic converter. You enjoy to find out why you are missfiring. But whatevere you do, pull over if the lighting flashes.

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I agree with PMB.... i enjoy a 97 thunderbird, same thing..... it say it's the rear O2 sensor...... near is a good indiscriminate it is and O2 sensor (Especially with 190,000) I would catch it checked very soon

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