Walker 245-1021 Mass Air Flow Sensor

Walker Mass Air Flow Assembly for Nissan and Mercury

Walker Mass Air Flow Assembly Part Number 245-1021 is a direct-fit engine management sensor assembly for select 1993-1995 Nissan Quest and Mercury Villager applications. It is built with a housing included and a 3-terminal female connector layout for a straightforward replacement on the listed vehicles.

Key Features

• Mass air flow sensor assembly for emission control and engine management systems
• Housing included for a complete assembly-style replacement
• 3-terminal design with female connector
• Fits 1993-1995 Nissan Quest and 1993-1995 Mercury Villager
• Walker Part Number 245-1021 for catalog and service matching

Product Line Details

Walker Mass Air Flow Assembly products are part of Walker Products’ engine sensor lineup. Walker has supplied fuel system and engine management components since 1946 and manufactures parts to meet or exceed OEM standards and specifications. The company supports production with engineering, product management, and technical documentation resources, and operates as an ISO 9001/IATF16949 certified manufacturer.

Detailed Description

This mass air flow sensor assembly measures incoming air for the engine control system so the vehicle can calculate fuel delivery more accurately. For 1993-1995 Nissan Quest and Mercury Villager models, Walker 245-1021 provides the correct assembly format with the housing included and a female connector interface. This makes it a practical replacement when servicing the original air metering unit on these applications.

This part cross-references AP Exhaust 641539 for the same application.

Common Issues It May Solve

• Rough idle caused by inaccurate air metering
• Hesitation during acceleration from a failing MAF sensor
• Check engine light related to airflow sensor faults
• Poor fuel control from incorrect intake air readings
• Driveability problems on 1993-1995 Nissan Quest and Mercury Villager models

Installation Notes and Tips

Verify connector style, terminal count, and housing configuration before installation. This assembly uses a 3-terminal female connector and does not include mounting hardware. Confirm the vehicle application against the listed fitment for 1993-1995 Nissan Quest and Mercury Villager before replacing the original sensor assembly.

Quality Assurance

Walker Products manufactures engine sensors and fuel system components to meet or exceed OEM standards and specifications. The brand’s ISO 9001/IATF16949 certification supports controlled production and application accuracy for parts such as Walker Mass Air Flow Assembly Part Number 245-1021.