[HMCK20]

I have a cel on my 06 si and i have hooked two obd2 scantools up to it and both of them say link error. Im about to take it into the dealer and listen to them ***** about me having mods on my car and how they will charge me a insane amount of money to fix it. The cel came on after a day of modding the car. I put a aem sri, greddy cat back, and teins on my car and it decided to throw this cel. i have reset my computer at least a dozen times. Anyone have any ideas what could be the problem with it? Thanks for the input