Walker 245-1299 Mass Air Flow Sensor

Walker Mass Air Flow Assembly for BMW

Walker Mass Air Flow Assembly Part Number 245-1299 is a direct-fit engine management component for select BMW diesel applications. It is built with a housing included and a 4-terminal female connector layout to support accurate airflow signal delivery for the engine control system.

Compatible With 2009-2013 BMW X5 and 2009-2011 BMW 335d, this mass air flow sensor assembly is a practical replacement when the original unit is no longer reading airflow correctly. Walker Products has supplied fuel system and engine sensor components since 1946, with manufacturing and engineering processes focused on OEM-level specifications.

Key Features

• Mass air flow sensor assembly for emission control and engine management systems
• Housing included for a complete assembly-style replacement
• 4-terminal female connector configuration
• Walker Mass Air Flow Assembly line for OE-style service parts
• Part Number 245-1299 for accurate ordering and lookup

Product Details

Walker 245-1299 is engineered for BMW X5 and BMW 335d applications where the mass air flow sensor must report incoming air volume to the engine computer. Accurate airflow data helps the control module manage fueling and drivability. This part cross-references Standard Ignition MAS0422 for the same application.

Common Issues This Part May Address

• Check engine light related to airflow sensor performance
• Rough idle or unstable engine operation
• Reduced fuel economy caused by incorrect airflow readings
• Hesitation or poor throttle response during acceleration
• Hard starting or inconsistent engine management feedback

Installation Notes

Verify connector style, terminal count, and housing configuration before installation. This assembly does not include mounting hardware. For best results, inspect the intake tract, electrical connector, and surrounding seals before replacing the sensor. Confirm vehicle application by year, make, and model before ordering Part Number 245-1299.

Quality Assurance

Walker Products is an ISO 9001 and IATF 16949 certified manufacturer with in-house product management and engineering support. The company states its engine sensor and fuel system components are produced to meet or exceed OEM standards and specifications.