Walker 245-1121 Mass Air Flow Sensor

Walker Mass Air Flow Sensor 245-1121

Walker Mass Air Flow Sensor 245-1121 is a direct-fit engine management replacement for select Lexus, Toyota, and Chevrolet applications. It is built with a 5-terminal female connector, includes mounting hardware, and is supplied without a housing for service on the existing intake assembly.

Key Features

• Mass Air Flow Sensor for emission control and engine management service
• Walker Mass Air Flow Sensor line from Walker Products
• 5-terminal female connector for the listed applications
• Mounting hardware included
• Housing not included
• OE-style replacement for select Lexus GS430, Lexus SC430, Toyota Corolla, and Chevrolet Prizm applications

Product Details

Walker Products has supplied fuel system and engine sensor components since 1946, with manufacturing and engineering support focused on meeting or exceeding OEM standards. Part number 245-1121 is part of the Walker Mass Air Flow Sensor line and is backed by the company’s ISO 9001/IATF16949 quality systems. This sensor is listed for 1999-2010 coverage across select Lexus GS430, Lexus SC430, Toyota Corolla, and Chevrolet Prizm fitments, making it a practical choice when replacing a failing mass air flow sensor on the original intake setup. This part cross-references Delphi AF10137 for the same application.

What It Helps Fix

• Rough idle caused by inaccurate airflow readings
• Hesitation or stumble during acceleration
• Check engine light related to air metering faults
• Poor fuel economy from incorrect air-fuel calculation
• Hard starting or unstable engine performance

Installation Notes

Verify connector style, terminal count, and fitment before installation. This sensor uses a female connector and 5 terminals, and it is supplied without a housing, so reuse the existing housing where applicable. Confirm the vehicle application against the listed fitment before ordering. Fits 2002-2010 Lexus SC430, N/A. Fits 2001-2005 Lexus GS430, N/A. Fits 2000-2002 Chevrolet Prizm, N/A. Fits 2000-2002 Toyota Corolla, N/A. Fits 1999 Toyota Corolla, N/A.

Quality Assurance

Walker Products manufactures engine sensors and fuel system components to meet OEM standards and specifications, supported by in-house manufacturing, product management, and engineering resources. The brand’s ISO 9001/IATF16949 certification reflects its quality management focus for aftermarket replacement parts.