Engine Coolant Temperature Sensor Overview

The engine coolant temperature sensor is an essential component of a vehicle's cooling system. This sensor monitors the temperature of the engine's coolant and relays this information to the engine control unit (ECU). The ECU then adjusts the fuel injection and ignition timing to ensure the engine operates efficiently and prevents overheating.

Why This Part is Needed

Without a properly functioning coolant temperature sensor, the ECU would lack critical data, which could lead to suboptimal engine performance, increased emissions, or even severe engine damage due to overheating.

How the Coolant Temperature Sensor Works

The sensor operates by measuring the electrical resistance of the coolant. As the temperature changes, so does the resistance, which is then converted into a temperature reading by the ECU.

Potential Issues When Broken

If the coolant temperature sensor fails, it can lead to a variety of problems including erratic idling, difficulty starting the engine, poor fuel economy, and triggering the check engine light. In worst-case scenarios, it can result in engine overheating, possibly leading to complete engine failure.

Compatibility

Compatible car models include:

• Q50
• Q70/M
• Qx80/Qx56
• M35/45
• Qx50/Ex
• G35
• Qx70/Fx
• Q70(201802-)Lam
• Qx4
• Q60/G Coupe
• Q40/G Sedan
• Q70/M Hybrid
• Fx35/45
• Q60/G Convertible
• I30/I35
• G20
• M45