Walker 245-1297 Mass Air Flow Sensor

Walker 245-1297 Mass Air Flow Sensor

Walker 245-1297 is a sensor-only mass air flow sensor for diesel BMW applications that need accurate airflow measurement and OE-style signal calibration. It is a direct replacement for select BMW 328d, 328d xDrive, and X3 models, with a black housing, 5 blade terminals, an oblong female connector, and 2 mounting holes.

Sensor Only Line Details

Walker’s Sensor Only line is built for replacement service where the sensor element is changed without the housing assembly. This format is typically faster and more economical, while still following Walker’s approach of programming and testing each unit for fit, form, and function before release. The 245-1297 is part of Walker’s mass air flow sensor program, which includes sensor-only and complete sensor-and-housing options.

Key Features

• Mass air flow sensor, sensor only
• Black finish with oblong female connector
• 5 blade terminals and 2 mounting holes
• Programmed and tested before sale
• Built to meet OE-style airflow calibration targets
• Walker part number 245-1297

Vehicle Fitment

• Fits 2014-2018 BMW 328d, N/A, Sensor Only
• Fits 2014-2018 BMW 328d xDrive, N/A, Sensor Only
• Fits 2015-2017 BMW X3, N/A, Sensor Only

Common Replacement Reasons

• Check engine light related to airflow sensor performance
• Rough idle or inconsistent engine response
• Incorrect fuel trim readings
• Reduced drivability from inaccurate air metering
• Failed or contaminated original MAF sensor

Installation Notes

Confirm connector shape, terminal count, and mounting style before installation. On BMW 328d, BMW 328d xDrive, and BMW X3 diesel applications, clean surrounding intake components and avoid touching the sensing element with bare hands. Some manufacturers specify replacing the complete housing assembly when contamination is present in the air tube or connector area.

Quality Assurance

Walker Products has supplied fuel system components since 1946 and is an ISO 9001/IATF 16949 certified manufacturer. The 245-1297 is produced as a new sensor, not remanufactured, and Walker states that its MAF calibrations are verified through production testing and on-vehicle testing. This part cross-references Gates 19779 for the same application.