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I have been running no Cats now for awhile and I just got my MIL Eliminators in, and the Check Engine Light has not turned off. Does it take a few miles for it to turn off or could it be something else thats making it turn on? I have them on for about 100 miles now.
Like I said before best way to tell why you have a CEL is to go to auto zone and they will check it for free. Then you will know what your problem is then you can figure out how to fix it.
Another good option.. if you keep throwing codes, find your local Harbor Freight, and buy their OBDII reader. Mine ran me $39.95 I think, works perfect on everything. the book they give you only generalizes the problem, and you have to research the rest, but it's been priceless for me when it comes to narrowing down possible problems.