Spectra MA473 Mass Air Flow Sensor

Spectra MA473 Mass Air Flow Sensor

The Spectra MA473 mass air flow sensor is built for Subaru applications that need accurate airflow measurement and stable engine management input. It is a direct-fit emission control sensor for select Subaru WRX STI, WRX, Forester, Impreza, Crosstrek, XV, Legacy, and Outback models.

Using a programmable ceramic circuit board with a premium silicon coating, this sensor is engineered to resist under-hood heat swings and road vibration. The circuit design also supports faster signal response and consistent readings from platinum resistance thermometer technology.

Key Features

• Mass air flow sensor for emission control and engine air measurement
• Programmable ceramic circuit board with protective silicon coating
• Built to handle temperature fluctuation and vibration exposure
• Fast signal response for stable airflow feedback
• Direct replacement for select Subaru fitments

Detailed Description

Part number MA473 is a Subaru-focused mass air flow sensor that helps the engine control system measure incoming air more accurately. It fits 2008-2021 Subaru WRX STI, 2012-2016 Subaru WRX, 2009-2018 Subaru Forester, 2008-2016 Subaru Impreza, 2016-2017 Subaru Crosstrek, 2013-2015 Subaru XV Crosstrek, 2013-2020 Subaru WRX STI, 2008-2019 Subaru Legacy, 2008-2019 Subaru Outback, 2013-2016 Subaru XV, and 2018-2019 Subaru XV. This part cross-references 22680AA38A and 22680AA380 for the same application.

What It Helps Solve

• Rough idle caused by inaccurate airflow readings
• Check engine light concerns related to the MAF circuit
• Hesitation or poor throttle response from unstable sensor output
• Fuel trim issues tied to incorrect air measurement
• Driveability problems after sensor wear or heat-related failure

Installation Notes and Tips

Verify the connector style and engine application before installation. Inspect the intake tract for dirt, oil contamination, or air leaks that can affect sensor readings. Clear diagnostic trouble codes after replacement and confirm idle quality and airflow data with a scan tool. For Subaru WRX STI, WRX, and Forester applications, confirm the exact year and engine configuration against the vehicle listing before ordering.

Quality Assurance

Spectra designs this sensor with a heat-resistant ceramic circuit board, silicon protection, and platinum resistance thermometer elements to support consistent operation in demanding under-hood conditions.