Walker 245-1173 Mass Air Flow Sensor

Walker Mass Air Flow Assembly 245-1173

Walker Mass Air Flow Assembly 245-1173 is a direct-fit mass air flow sensor assembly for select BMW and Land Rover applications. It is built with a female connector, 5 terminals, and a housing included for a complete sensor assembly replacement.

Walker Products has supplied fuel system and engine management components since 1946, with manufacturing and engineering support focused on meeting or exceeding OEM standards. The Walker Mass Air Flow Assembly line is part of that engine sensor portfolio, giving technicians and DIY repairers a replacement option for air metering service on covered vehicles.

Key Features

• Mass air flow sensor assembly for engine air measurement
• Housing included for a complete assembly-style replacement
• Female connector with 5 terminals
• Direct-fit application coverage for select BMW 540i, BMW X5, BMW Z8, BMW 740i, BMW 740iL, and Land Rover Range Rover models
• Walker part number 245-1173 for catalog and cross-reference lookup

Detailed Description

Walker 245-1173 is a mass air flow sensor assembly used to measure incoming engine air so the vehicle’s control system can manage fuel delivery accurately. This part is listed for 1999-2003 BMW 540i, 2000-2003 BMW X5, 2003 BMW Z8, 1999-2001 BMW 740i, 1999-2001 BMW 740iL, and 2003-2004 Land Rover Range Rover applications. If you are searching for a BMW 540i mass air flow sensor, BMW X5 MAF assembly, or Land Rover Range Rover air flow sensor replacement, this part number is the relevant match for those listed vehicles.

Walker Products backs its engine sensor line with in-house manufacturing, product management, and engineering support, and the company states that its products are produced to meet or exceed OEM standards and specifications. This part cross-references Standard Ignition MAS0309 and Spectra Premium MA241 for the same application.

Common Reasons for Replacement

• Rough idle or unstable engine speed caused by inaccurate air metering
• Reduced throttle response from a failing mass air flow sensor
• Check engine light related to airflow or fuel trim faults
• Poor fuel economy from incorrect air/fuel calculation
• Driveability issues on covered BMW and Land Rover models

Installation Notes and Tips

Verify connector style, terminal count, and housing configuration before installation. Confirm the vehicle application by year, make, and model, and inspect the intake tract for contamination, damaged wiring, or air leaks that can affect sensor readings. Use the listed fitment only for 1999-2004 BMW and Land Rover applications shown above.

Quality Assurance

Walker Products is an ISO 9001/IATF 16949 certified manufacturer with long-standing experience in fuel system and engine sensor production. The brand states that its parts are engineered and supported to align with OEM-level specifications and application accuracy.