Ive had an issue in the past with an Insignia 160 CDTI that someone had been messing about with doing SPS's and managed to fudge it up. It had all sorts of ECU errors and mismatches and the car was in SVS mode.
I had to reset the ECM and reprogram it and load the latest data back onto it and reconfigure it to the car. This in turn also affected a few other controllers that needed to be configured again. Im not sure if the Focus RS uses the same style of Can-BUS