Walker 245-1174 Mass Air Flow Sensor

Walker Mass Air Flow Assembly for BMW

The Walker Mass Air Flow Assembly, part number 245-1174, is a direct-fit engine management sensor for select BMW applications. It is built with a housing included and a 6-terminal female connector layout for a precise replacement on supported BMW 325Ci, 325i, X3, and Z4 models.

Walker Products has supplied fuel system and engine sensor components since 1946, with manufacturing and engineering processes focused on meeting or exceeding OEM standards. The Walker Mass Air Flow Assembly line is part of that engine management range, giving buyers a replacement option backed by application data and technical support.

• Housing included for a complete sensor assembly replacement
• 6-terminal female connector configuration
• Direct-fit Walker Mass Air Flow Assembly, part number 245-1174
• Engine management sensor for select BMW 3 Series, X3, and Z4 applications
• Built by an ISO 9001/IATF16949 certified manufacturer

Fitment and Application Details

Compatible With BMW engine management applications including Fits 2004-2006 BMW 325Ci, N/A; Fits 2004-2005 BMW 325i, N/A; Fits 2004-2005 BMW X3, N/A; Fits 2003-2005 BMW Z4, N/A; and Fits 2003 BMW 325Ci, N/A. Additional BMW coverage includes Fits 2006 BMW X3, N/A and Fits 2003 BMW 325i, N/A. The Walker 245-1174 is listed for 2003-2006 BMW fitments across these models, including BMW 325Ci, BMW 325i, BMW X3, and BMW Z4.

What This Sensor Helps Address

• Rough idle caused by inaccurate airflow measurement
• Hesitation or stumble during acceleration
• Check engine light concerns related to mass air flow readings
• Fuel trim issues from incorrect air metering data
• Poor drivability on BMW 325Ci, 325i, X3, or Z4 applications

Installation Notes and Tips

Verify connector style, terminal count, and housing configuration before installation. This assembly uses a female connector and does not list mounting hardware included. Confirm the vehicle’s exact year and engine management application against the fitment data for BMW 325Ci, BMW 325i, BMW X3, and BMW Z4 before replacing the original sensor. The part number 245-1174 should be matched to the existing application and connector layout during diagnosis.

Quality Assurance

Walker Products manufactures engine sensors and fuel system components to meet or exceed OEM standards and specifications. The company supports production with in-house manufacturing, product management, engineering, and technical documentation, and operates as an ISO 9001/IATF16949 certified company. This part cross-references Delphi AF10223 for the same application.