Walker 211-91042 Engine Coolant Temperature Sensor

Engine Coolant Temperature Sensor for Mazda, Ford, and More

Walker Products 211-91042 is an engine coolant temperature sensor built to report real-time coolant temperature to the ECM. Accurate temperature input helps the engine manage fuel delivery, ignition timing, cold-start enrichment, and cooling fan operation.

This Walker Full Service Kit application is a direct-fit replacement for a wide range of Mazda, Ford, Mercury, and Land Rover vehicles, including Mazda 3, Mazda 6, Mazda MX-5 Miata, Ford Fusion, and Mercury Milan applications.

Key Features

• Blade terminal type with a 2-terminal electrical connection
• Female rectangle connector for factory-style fitment
• 12.0 threaded end diameter
• No wiring harness included
• Engineered to match OE resistance values, thermal response, and signal output
• Heat-resistant construction for exposure to coolant, vibration, and temperature swings

Product Details

Walker Products part number 211-91042 is designed to deliver stable coolant temperature readings so the ECM can make the correct adjustments during warm-up, normal driving, and high-temperature operation. The sensor’s direct-fit design supports straightforward replacement on vehicles such as the 2004-2009 Mazda 3, 2003-2008 Mazda 6, 2006-2009 Ford Fusion, and 2006-2009 Mercury Milan. It also serves additional applications across the 1997-2015 model years listed below. If you are replacing a failed coolant temp sensor or diagnosing a check engine light, 211-91042 provides the OE-style electrical characteristics needed for factory system integration.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Sensor Can Address

• Incorrect coolant temperature readings at the ECM
• Hard cold starts or extended warm-up behavior
• Cooling fan operation concerns tied to temperature input
• Fuel mixture or ignition timing issues related to sensor signal errors
• Check engine light conditions caused by coolant temperature sensor faults

Installation Notes and Tips

• Verify connector shape, terminal count, and threaded end diameter before installation.
• Inspect the connector and wiring for corrosion, damage, or coolant intrusion before replacing the sensor.
• Confirm the engine location and application notes for your vehicle, especially on Mazda 3 and Mazda 6 listings with engine-specific notes.
• Use the vehicle’s service procedure for coolant level management and sensor removal/installation.

Quality Assurance

Walker Products builds this coolant temperature sensor to OE specifications for resistance, thermal response, and signal output, supporting reliable operation with factory engine management systems.