Engine Coolant Temp Sensor for Nissan engines

Why you need it

This tiny sensor is the ECU’s thermometer. It tells the computer how hot the coolant is so it can set cold-start fuel enrichment, idle speed, ignition timing, and switch the radiator fan on time. With a good unit, you get easy starts, smooth idle, clean emissions, proper power, and solid fuel economy.

How it works

Inside sits an NTC thermistor. When coolant heats up, resistance drops; the ECU reads the voltage change and calculates temperature. A tapered/threaded body seals in the housing, while a two-pin plug carries signal and ground. Stable readings mean precise fueling across all conditions.

What happens if it’s broken ⚠️

Hard cold starts, rich running (fuel smell, black smoke),rough idle, poor mileage, late fan activation, overheating, and random stalling can occur. You may see a temp gauge mismatch and fault codes for the temp circuit. Long-term rich mix can foul plugs and damage the catalyst.

Install tips ️

Work on a cool engine, relieve pressure, drain a little coolant, replace the sealing washer, avoid tape on the tip, torque to spec, reconnect the plug cleanly, then bleed air from the system.

Compatibility

• Pickup
• Truck-Hardbody
• Caravan