NISSAN 25080-89907 Coolant Temperature Sensor

The genuine Nissan 25080-89907 coolant temperature sensor is a premium quality, original OEM component that plays a critical role in optimal engine operation and thermal management. The sensor continuously measures the engine coolant temperature and transmits this data as electrical signals to the Engine Control Unit (ECU).

Operating Principle and Function

This sensor operates as an NTC (Negative Temperature Coefficient) thermistor, meaning its electrical resistance decreases as the temperature rises. Based on these resistance variations, the ECU calculates precise fuel mixture formation (air-fuel ratio), ignition timing, and the activation cycle of the cooling fans. During cold starts, the sensor ensures a richer mixture to maintain a stable idle.

Technical Specifications

• Type: NTC thermistor-based temperature sensor
• Material: High thermal conductivity brass body for precise measurement, paired with a durable plastic connector
• Connector Design: Genuine Nissan specification, moisture- and dust-resistant connector
• Installation Location: Typically located in the cylinder head or near the thermostat housing

Typical Symptoms of Failure

Aging or failure of the coolant temperature sensor can cause severe operational issues. The most common symptoms include:

• Difficult engine starting, particularly in cold weather
• Unusually high fuel consumption due to an overly rich fuel mixture
• Black smoke from the exhaust
• Continuous operation or complete failure of the cooling fan
• Illuminated "Check Engine" light on the instrument cluster (DTC trouble codes: e.g., P0115, P0117, P0118)

To protect the engine and maintain proper fuel efficiency, a faulty sensor should be replaced immediately. The genuine Nissan OEM part guarantees a perfect fit and a long service life.