I had this same issue after I got my tune. What happened was during the tune one of the gaskets blew causing an exhaust leak. Have a look at the down pipe flanges with either a feeler gauge or a pick tool of some sort to check for an exhast leak between all flange gaskets. Give that a shot the P2A00 can be troublesome to diagnose but give these steps a shot
Check for the following
-exhaust leak
-intake leak
-injector problem
-O2 or AF sensors (these have been ruled out)
Buy a standard cable and diagnose it yourself by reading all the cipher data logs
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