Walker 245-1621 Mass Air Flow Sensor

Walker Sensor Only Mass Air Flow Sensor

Walker 245-1621 is a sensor-only mass air flow sensor built for direct replacement service on select Mazda applications. It is a standard replacement part with a black plastic housing, 5-wire pin terminal design, and a female oblong connector for a factory-style connection.

Compatible With Mazda MX-5 Miata, Mazda 3, Mazda CX-5, Mazda CX-50, Mazda 2, Mazda CX-30, Mazda MX-5, Mazda 6, and Mazda CX-3 applications listed below. The Walker Sensor Only line is designed for faster, more economical MAF service when the housing does not need replacement.

Key Features

• Sensor-only mass air flow sensor for targeted replacement service
• Walker part number 245-1621
• Black plastic housing with flange mounting
• 5-wire, 5-terminal pin connection with 1 female connector
• Standard replacement grade for OE-style service
• Housing included for this application listing
• Mounting hardware included for this application listing

Product Details

Walker Products builds this MAF sensor as a new, tested replacement component rather than a remanufactured unit. The sensor is programmed and verified for fit, form, and function before release, and Walker uses custom tuned flow characteristics to match the vehicle’s airflow range. For Mazda drivers, that means a direct-fit service part for restoring accurate airflow measurement on vehicles such as the Mazda 3, Mazda CX-5, and Mazda MX-5 Miata. Part number 245-1621 is also cross-referenced to PYFS13215 for the same application.

What This Sensor Helps Address

• Rough idle caused by inaccurate airflow readings
• Check engine light related to mass air flow sensor performance
• Hesitation or poor throttle response
• Fuel trim issues from incorrect air metering
• Reduced drivability from a failing MAF sensor

Installation Notes

Before installation, inspect the air intake tract, connector, and surrounding surfaces for dirt, oil, or damage. Handle the sensor carefully to avoid contamination, and confirm the connector shape, terminal count, and mounting style match the original unit. For sensor-only service, reuse the existing housing only if it is clean and in good condition.

Fits 2020-2025 Mazda MX-5 Miata, sensor only; 2019-2024 Mazda 3, sensor only; 2018-2024 Mazda CX-5, sensor only; 2023-2024 Mazda CX-50, sensor only; 2018-2023 Mazda 2, sensor only; 2020-2023 Mazda CX-30, sensor only; 2019-2023 Mazda MX-5, sensor only; 2018-2021 Mazda 6, sensor only; 2019-2021 Mazda CX-3, sensor only.

Quality Assurance

Walker Products has supplied fuel system components since 1946 and is an ISO 9001 and IATF 16949 certified manufacturer. This MAF sensor is produced with OEM-quality components and undergoes production testing and on-vehicle verification to support consistent performance.