Walker 245-1262 Mass Air Flow Sensor

Walker Mass Air Flow Assembly for BMW

Walker Mass Air Flow Assembly 245-1262 is a direct-fit mass air flow sensor assembly for select BMW applications. It is built for vehicles that require a 5-terminal, female-connector sensor with mounting hardware included, making it a practical replacement for drivability and fuel-management service.

Compatible with BMW 545i, X5, 645Ci, 745i, and 745Li applications, this Walker mass air flow sensor assembly supports accurate airflow measurement for the engine management system. Part number 245-1262 is also a fit-focused option for BMW owners servicing intake and sensor-related faults.

Key Features

• Mass air flow sensor assembly for emission control and engine management service
• 5-terminal design with female connector
• Mounting hardware included
• Housing not included
• Walker Mass Air Flow Assembly 245-1262 for select BMW models

Product Details

Walker Products has supplied fuel system and engine sensor components since 1946, with manufacturing and engineering processes focused on meeting or exceeding OEM standards and specifications. The Walker Mass Air Flow Assembly line is part of that broader engine management offering, which includes sensors and fuel system components for aftermarket repair. Part number 245-1262 is engineered for the BMW fitments listed below and is cross-referenced to Standard Ignition MAS0413 for the same application.

Fits 2006 BMW 545i, N/A. Fits 2004-2006 BMW X5, N/A. Fits 2004-2005 BMW 545i, N/A. Fits 2004-2005 BMW 645Ci, N/A. Fits 2004-2005 BMW 745i, N/A. Fits 2004-2005 BMW 745Li, N/A. Fits 2003 BMW 745i, N/A, vehicles manufactured from September 2003. Fits 2003 BMW 745Li, N/A, vehicles manufactured from September 2003.

Common Repair Uses

• Restores airflow signal accuracy after a failing mass air flow sensor
• Addresses rough idle or hesitation tied to incorrect air measurement
• Helps correct lean or rich fuel-trim conditions caused by sensor drift
• Supports repair of check engine light concerns related to airflow metering
• Replaces a damaged or unreliable BMW MAF sensor assembly

Installation Notes and Tips

Verify connector style, terminal count, and vehicle build date before installation. This assembly uses a female connector and includes mounting hardware; the housing is not included. For 2003 BMW 745i and 745Li applications, confirm the vehicle was manufactured from September 2003. Inspect the intake tract for leaks or contamination before installing the new sensor.

Quality Assurance

Walker Products manufactures engine sensors and fuel system components to meet or exceed OEM standards and specifications. The company is ISO 9001/IATF16949 certified and supports product accuracy with in-house manufacturing, engineering, and technical support resources. Part number 245-1262 reflects that quality-focused approach for BMW 545i, X5, 645Ci, 745i, and 745Li service.