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.
Average mileage: 167,000 (150,000–184,000)
Engines affected: 3.0L V6, 3.4L V6
11 people reported this problem
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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.