Hella 009107221 Engine Coolant Temperature Sensor

Engine Coolant Temperature Sensor Overview

This Hella engine coolant temperature sensor is a bolted, single-connector replacement built around an NTC sensing element. It uses a 12V electrical rating, M12x1.25 thread size, and a black housing for a direct service-style fit on supported applications.

Compatible With Nissan and INFINITI applications including the Nissan 240SX, Maxima, Sentra, and 300ZX, plus INFINITI J30, Q45, G20, and M30 fitments. Part number 009107221 is also referenced by multiple aftermarket cross numbers for the same application.

Key Features

• NTC sensor design for coolant temperature signal input
• Bolted mounting style for secure installation
• Single electrical connector for simplified replacement matching
• M12x1.25 thread size for supported threaded ports
• 12V rated electrical specification
• Black housing finish

Detailed Description

Hella 009107221 is an engine coolant temperature sensor used to report coolant temperature to the engine management system. The NTC sensor element changes resistance with temperature, allowing the control system to monitor operating conditions and respond to cold-start, warm-up, and temperature-related fueling or timing strategies. This part number 009107221 is listed for a wide range of Nissan and INFINITI vehicles, including the Nissan 240SX, Maxima, Sentra, and 300ZX, as well as INFINITI J30, Q45, G20, and M30 applications.

The bolted mounting style and M12x1.25 thread size help match the original service interface on supported vehicles. With one connector and a 12V electrical rating, this sensor is specified for straightforward electrical and mechanical replacement where the original unit uses the same configuration. Part number 009107221 is a fitment-specific coolant temperature sensor for older Nissan and INFINITI cooling system service.

What It Helps Address

• Incorrect coolant temperature readings at the engine control system
• Hard starting during cold engine operation
• Rough warm-up behavior after startup
• Temperature-related drivability concerns tied to sensor signal errors
• Cooling system monitoring faults caused by a failed sensor

Installation Notes and Tips

Verify the thread size, connector count, and mounting style against the original sensor before installation. Confirm the application by year, make, and model, since this part number 009107221 is used across multiple Nissan and INFINITI platforms. Clean the mounting port and inspect the connector for corrosion or damaged terminals before fitting the replacement.

Quality Assurance

Hella is an established automotive parts brand with broad OE and aftermarket coverage. This sensor is built to match the specified electrical and mechanical requirements for supported applications.