My ECU suddenly kicked off the flashing 12 error code, indicating an AT error. I assume that means "Air Temperature". I looked for the specific replacement part number (assuming it's a stock Ford component) and where it's located on the engine, without success.

Another side effect is that I can longer connect from my computer to the ECU. This all worked previously. I've replaced the ECU fairly recently, as I had a failure in my original ECU. Not sure if it's really a sensor issue, or another (expensive) ECU failure.

The car seems to run fine otherwise, but I would prefer to run without the flashing 12 code, and inability to access through the PE3 software. As an aside, the data from my AIM software looks fine.

Any help would be appreciated.