Welcome to the world of the 4.6. Mine comes on, then goes off after about 4 cold starts just like the manual says it should, then stays off for a while, then comes back on. Seems to be a routine almost. Mostly does it when I get on it, though. I know of others that have the problem and don't have the K&N. And yes I do have the K&N and had it on there for probably over 15-16k miles before it started doing the check engine light thing. Dallas Mustang sells a deal that shuts off the check engine light or tricks the computer some how so it doesn't turn on that feature and screw up engine performance. You practically have to get one or live with the light when you put on offroad exhaust with the 4.6 cause of the new OBD-II computer.
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