Check Engine Light Due to Failed Coolant Temperature Sensor on Toyota 4Runner

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: 167,000 (150,000–184,000)
Engines affected: 3.0L V6, 3.4L V6
8 model years affected: 1990, 1992, 1993, 1994, more1995, 1996, 1997, 2005
9 people reported this problem
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2005 Toyota 4Runner - 3.0L V6 184,000 mi,
My 4 runner engine temperature gauge kept moving into the red, I took it to the Toyota dealership and they did a diagnostic test telling me that the problem was a broken temperature coolant sensor.