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I have a 98 EX that I bought a used auto tranny for from Craigslist. Silly me didn't check to make sure it was for an EX. Turns out its a DX. Put it in and I already knew it would throw a code. Of course incorrect gear ratio is what it throws. My question is can I take an ecu out of a DX and expect no codes? I know vtec won't work but I really don't care because I'm just trying to sell it without a code.

 
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Do you plan on telling the buyer what has been done to it? Or do you plan on telling them it runs great after you swap the ecu?

 
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Yeah of course I'll tell them. I bought it with a blown tranny just to flip and I'm selling it to a guy I work with. He rode in the car with the blown tranny first. I just need to know if it will be plug and play with no codes or not?