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· Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
17,568 Posts
If it happened during a jump start while the battery was failing or during a battery replacement, a voltage spike may have occurred and froze the logic of the thermometer. I would first try another battery disconnect, pause and reconnect to attempt a reset. Reset the clock.
-40°F is the default temperature when the 2-wire plastic ambient temp sensor (mounted under the front bumper and easily hit) is in open circuit.
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