Check Engine Light Due to Failed Coolant Temperature Sensor on Toyota Tacoma

At higher mileages (125,00+) the Engine Coolant Temperature Sensor may intermittently stop working, especially when the vehicle is fully warmed up. This can result in illumination of the Check Engine Light and/or an engine stalling problem.

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Average mileage: 217,750 (134,000–280,000)
Engines affected: 2.4L 4 Cylinder, 2.7L 4 Cylinder, 3.4L V6
3 model years affected: 1995, 1996, 1997
7 people reported this problem
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problem details
1997 Toyota Tacoma - 2.7L 4 Cylinder 185,000 mi,
Have similar symptoms (dificulaty starting when engine is warm and turned off for 10 minutes or less) Would like to replace engine coolant sensor but do not know where it is located.
1997 Toyota Tacoma - 3.4L V6 134,000 mi,
Check Engine Light = ON DTC P0116 active Engine occasionally goes into high idle when warm... using an ELM327 scanner I was able to see that the high idle shift corresponds to erratic coolant temperature readings.
1995 Toyota Tacoma - 3.4L V6 272,000 mi,
Engine intermittently goes into high idle while warming up or when at operating temperature. Replaced coolant temperature sensor (was very brittle) and problem has gone away for now. The plastic on the sensor was brittle but functioning withing range at the time of testing, (tested with multi-meter and thermometer according to FSM). Still it was in bad shape and would not trust it to read accurately after so many miles, hours and cycles up to operating temperature.
1997 Toyota Tacoma - 2.4L 4 Cylinder 280,000 mi,
stalling, hard starts