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I had my air temp sensor fail once in an open condition (broken wire) and that caused the megasquirt to think the temp was -40C. I am not sure how helpful this is, but I would check the wiring by unplugging the sensor and wiggling the wire around to see if the two wires are shoring together causing the high temperature signal. I bit of a shot in the dark, but it is free to try ;-).
Sean
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