What is a non-obvious cause for a faulty temperature sensor?
My MacBook Air suffers from intermittent slowdowns and unnecessary fan use. I sent it to Apple under warranty and they replaced the battery and the logic board. But the problem persists and iStats shows that the temperature is reading -128 C.
It seems that Apple was right to replace the logic board which includes the temperature sensor (right?) But, why didn't that fix the problem? It seems very unlikely to have two faulty logic boards, both with bad sensors.