Spectra MA478 Mass Air Flow Sensor

Spectra MA478 Mass Air Flow Sensor

The Spectra MA478 mass air flow sensor is a standard replacement part built for accurate airflow measurement and stable engine management. It uses a programmable ceramic circuit board with a premium silicon coating to help protect the sensor from under-hood heat swings and road vibration. Compatible With BMW 550i, 650i, 750i, X5, and X6 applications across multiple model years.

Key Features

• Mass air flow sensor for emission control and engine air metering
• Programmable ceramic circuit board with silicon coating
• Fast signal response for consistent airflow readings
• All-platinum resistance thermometer sensor design
• Black plastic housing with oval 1-connector, 5-terminal male pin configuration
• Standard replacement grade for direct-fit service applications
• No housing, wiring harness, mounting bracket, or mounting hardware included

Detailed Description

The Spectra MA478 is engineered to measure incoming air so the engine control system can adjust fuel delivery and maintain proper drivability. Its circuit design is built for quicker signal response and consistent output, while the silicon-coated ceramic board adds protection against vibration and temperature variation common in daily driving. This part cross-references Delphi AF10421 for the same application. For BMW owners searching for a BMW 550i mass air flow sensor, BMW 750i MAF sensor, or BMW X5 air flow sensor replacement, the MA478 provides a direct service option for the listed vehicles.

What It Helps Address

• Rough idle caused by inaccurate airflow readings
• Hesitation or sluggish throttle response
• Check engine light related to air metering faults
• Poor fuel control from a failing MAF sensor
• Driveability issues on BMW 650i, 750Li, X6, and related applications

Installation Notes and Tips

• Verify the connector shape, terminal count, and mounting style before installation.
• Inspect the intake tube and air filter housing for leaks or contamination before replacing the sensor.
• Handle the sensing element carefully and avoid touching the internal components.
• Clear diagnostic trouble codes after installation and confirm idle quality and throttle response.
• Use the fitment list to confirm the exact BMW year and model match before ordering.

Quality Assurance

Spectra manufactures this sensor as a standard replacement part for emission control service. The MA478 is built with a protected circuit design and platinum resistance sensing elements to support consistent operation in demanding under-hood conditions.