Yes it seems like between 31557 and 31662 miles your exterior temperature sensor got busted.
Mine did and it goes to -40 degree celcius. The ext. temp sensor is located under the front drivers wheels underpanel, pretty tough location, imho, so i relocated it to the brake duct.
Feilay, when you replaced the new sensor did you DIY or have someone do it.
When mine busted I saw that the temp sensor wire had severed in two and I had to splice the wires. If the spliced wires came apart for some reason you will be having the same reading as if the sensor was not there.
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