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My 99 Taurus stays with the check engine light on. It will not go away. We changed the sensors and we are still having the same issue. The car shut off if it is in idle mode ex. I am waiting at a light after a min it shuts off. I found a trick to this problem as long as the as/heat is pushing it will not shut off. I have been doing this for about 3 \ 4 months. Ant idea what would be causing this issue.
What sensors did you change? did you pull codes? have you pulled codes recently? If the check engine light is on, that means you have a "Hard fail" so the codes will tell you what the problem is. From your description of it going away while idling at a light, I suspect that you have a vacuum leak.