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Q: coolant temperature sensor on 2002 Nissan Pathfinder

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
where is the coolant temperature sensor and how to replace?
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There are two temperature switches on is for the operation of the temperature gauge and the other switch tells the fuel injection computer the temperature of the engine coolant.
The Fuel injected related switch is at the back of the engine (passenger side) It has a light green and red wire and a black wire at the switch.
The temperature gauge switch has a single wire on the switch yellow and red wire at the switch.
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