Product Function Description

The engine coolant temperature sensor (part number 22630-95F0B) is a critical component of your Nissan or Infiniti‘s engine management system. Its primary function is to measure the temperature of the engine coolant and transmit this data to the engine control unit (ECU) via a variable resistance signal. The sensor uses a Negative Temperature Coefficient (NTC) thermistor, meaning its resistance decreases as coolant temperature rises . The ECU uses this signal to calculate critical parameters including fuel injection quantity and timing, ignition timing, and cooling fan activation . For compatible Nissan and Infiniti vehicles, a properly functioning coolant temperature sensor is essential for cold-start performance, fuel efficiency, and overall engine reliability.

Common Symptoms of a Failing Coolant Temperature Sensor

If you are experiencing any of the following symptoms, your engine coolant temperature sensor may be failing and in need of replacement:

• Hard cold starting or extended cranking: The engine requires long cranking times before firing, especially when cold. The ECU defaults to a preset temperature value when the sensor signal is lost, causing incorrect fuel enrichment 

• Higher fuel consumption: The engine continues to run in cold-enrichment mode even after reaching operating temperature, wasting fuel 

• Radiator fan runs immediately after start-up: The cooling fan activates within seconds of starting the engine, even when cold. This indicates the sensor is sending an incorrect hot-temperature signal

• Check Engine Light with codes P0116, P0117, or P0118: These diagnostic trouble codes directly indicate coolant temperature sensor circuit faults 

• Erratic or incorrect temperature gauge reading: The dashboard gauge reads incorrectly, fluctuates, or does not move at all 

• Poor emissions performance: Increased CO emissions during testing due to incorrect air/fuel mixture 

If you have confirmed these symptoms through inspection, replacing the coolant temperature sensor is the recommended solution.

 Product Attributes

Component Location & Core Function

Location: The engine coolant temperature sensor is threaded into a coolant passage on the engine, typically near the thermostat housing or intake manifold. It is positioned so the sensor tip is in direct contact with the engine coolant flow .

Connections: The sensor threads into the coolant passage with an M12 x 1.5 thread . It connects to the engine wiring harness via a 2-pin electrical connector with an oval shape . The housing color corresponds to the original part, typically red or blue . A sealing ring is included to prevent coolant leaks at the mounting point .

Core Function: The coolant temperature sensor serves as the primary temperature feedback device for the engine management system. It continuously monitors coolant temperature and provides a resistance signal to the ECU that varies inversely with temperature (NTC type). The ECU uses this signal to adjust fuel injection quantity and timing for cold and warm operation, control ignition timing, manage cooling fan activation, and ensure proper emissions control . Without an accurate temperature signal, the ECU defaults to a preset value, causing drivability issues and increased fuel consumption.

Package Contents

1 x Engine Coolant Temperature Sensor (Part Number 22630-95F0B) with sealing ring. Note: Electrical connector and mounting hardware are NOT included unless stated. Please confirm compatibility with your vehicle’s model and engine before purchasing.

 Installation Guidelines

Tools typically required:

• Socket wrench set (metric)

• Drain pan for coolant

• Torque wrench

• Safety gloves and eye protection

General installation reference (always follow vehicle-specific service manual):

Important:

• Ensure the engine is completely cool before working on the cooling system.

• Use a new seal/O-ring – Old seals may leak.

• Torque the sensor properly – Over-tightening can damage the threads.

• Bleed the cooling system after refilling to remove air pockets.

• If you are unsure about any step, consult a qualified mechanic.

Installation Tips & Common Mistakes

The Mistake When Replacing a Coolant Temperature Sensor:

❌ Wrong: Failing to drain coolant or over-tightening the sensor into the engine block.

✅ Correct:

1. Always drain coolant first – Coolant will spill when the sensor is removed.

2. Use a new seal – A worn seal causes coolant leaks.

3. Torque properly – Over-tightening can damage the threads in the engine block.

4. Clear fault codes – After installation, use a scan tool to clear codes and verify no new codes appear.

5. Check live data – Verify the sensor reads correct temperature after installation.

⚠️ Remember: A temperature sensor that is not properly sealed will leak coolant and cause overheating. Always use a new seal and torque to specification.

Common Customer Concerns & Our Solutions

We understand that purchasing a coolant temperature sensor can raise questions and concerns. Here is how we address the most common issues our customers face:

“What if I install it and the car still has cold-start issues?” – Check that the connector is fully seated and the mounting threads are properly sealed. Verify no coolant leaks are present. Use a scan tool to check for any remaining fault codes. If codes persist, check the wiring harness for damage.

“Can I replace just the sensor without draining all the coolant?” – Yes, the sensor can be replaced quickly with minimal coolant loss if done when the engine is cold. Have a container ready to catch the small amount of coolant that may drain.

“Customer says the temperature gauge reads incorrectly after sensor replacement.” – Verify that the correct sensor was installed (for ECU, not the gauge sender). Check the connector and wiring. Use a scan tool to compare coolant temperature to intake air temperature when cold .

After-Sales Service & Warranty

This product is covered by our quality assurance. If you have any questions or issues regarding fitment or quality, please contact us and we will respond within 24 hours.

Related Product Recommendations

When replacing the coolant temperature sensor, it is often recommended to inspect and consider replacing the following related components at the same time.