They said there were conflicting codes re: air flow (too much, too little) from CEL codes and ATC codes. Now driving a loaner while ABS is sorted out, and they've noted that the thermostat is failed in the open position (assume they learned this while pulling codes). Going on day 6 with a loaner car.
I hope that everything is straightened out. It is significant that the techs were able to say the thermostat failed in the open position. That is a common problem; I'm going in for a new thermostat tomorrow after an ECU flash at my first visit failed to cure the "low coolant temperature" fault code. Some folks with this code are getting resets, but the final solution seems to be replacing the thermostat. What is the TC light?