It's a sensor. I had one that was cracked. When the car warmed up the heat caused the crack to expand and the sensor wouldn't work. After the car cooled it was fine until it got hot again. The sensor is probably gone for good now. You would need diagnostics or troubleshooting to determine which one. You can get a hand held diagnostic computer for cars. Some auto parts stores check for free. You could see if any does a loan-a-tool.
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