Walker 211-2129 Engine Coolant Temperature Sensor

Engine Coolant Temperature Sensor for Mazda CX-9

Walker 211-2129 is an engine coolant temperature sensor built for accurate ECM temperature input on the 2007 Mazda CX-9. It uses a square connector with a female connector body, blade pin terminals, and a 2-terminal layout for direct replacement service.

Key Features

• Engine coolant temperature sensor for ECM temperature reporting
• Square connector shape with female connector gender
• Blade pin terminals with 2-terminal design
• Male terminal gender for factory-style electrical connection
• Engineered to match OE resistance values, thermal response, and signal output
• Heat-resistant construction for exposure to coolant, vibration, and temperature swings
• Direct-fit replacement for service on the 2007 Mazda CX-9

Product Details

Walker Sensor Only 211-2129 is built to provide the engine control module with real-time coolant temperature data so the system can manage fuel injection, ignition timing, cold start enrichment, and cooling fan operation. For the 2007 Mazda CX-9, this sensor supports accurate temperature feedback that helps the ECM maintain proper engine performance, fuel economy, and emissions control. Walker Products 211-2129 is designed as an OE-style replacement with the electrical characteristics needed for factory system integration.

This part cross-references no listed interchange numbers for the same application.

Common Issues This Sensor Can Address

• Check engine light related to coolant temperature signal faults
• Incorrect coolant temperature readings at the ECM
• Hard cold starts or poor cold-start enrichment control
• Cooling fan operation problems caused by inaccurate temperature input
• Fuel mixture and ignition timing issues tied to temperature data

Installation Notes and Tips

Verify the connector shape, terminal count, and terminal gender before installation. Confirm the sensor location on the cooling system and inspect the harness connector for corrosion, bent terminals, or coolant contamination. Use the vehicle service procedure for the 2007 Mazda CX-9 to ensure proper torque and sealing during replacement.

Quality Assurance

Walker Products engineers this sensor to OE specifications for resistance values, thermal response, and signal output. The durable construction is intended for long-term exposure to coolant and engine heat in normal service conditions.