Runner

For the last three weeks my car has been cutting out intermittingly under load. When I brought it in to the dealer 2 weeks back for the 25K oil change. I mentioned it to them. They said that it was pretty common this time of year due to the cold and I may have some water in the fuel. Later, I checked the car out with a VAG tool and got "DTC of 16795 - Secondary Air Injection system, Incorrect flow Detected" engine fault. Today, it started cutting out upon acceleration then the EPC light went on and my car would not rev over 1200 RPM's! I pulled over and shut the engine down, restarted a few seconds later and made it home without issue. My car has been APR chipped for over a 1.5 years without issue. I hope it's not the ECU. Anyone here run into this and what was done to resolve it. TIA