Standard Motor Products MAS0239 Mass Air Flow Sensor MAF

The Standard Motor Products MAS0239 is a direct-fit, 100% new mass air flow (MAF) sensor designed to restore precise airflow measurement and proper engine management. Unlike remanufactured alternatives, this sensor is built from all-new components — meaning no leftover debris or wear that could compromise accuracy or trigger drivability issues.

The MAF sensor monitors the volume and density of air entering the intake manifold and relays that data to the Engine Control Unit (ECU). Accurate airflow readings are critical for calculating the correct air-to-fuel ratio, maintaining fuel efficiency, and achieving clean combustion. A failed or contaminated MAF sensor can cause rough idle, hesitation, poor fuel economy, and check-engine lights.

Key Features:

• 100% new construction — never remanufactured — eliminates contamination risk from prior use
• Computer-tested to verify accurate airflow output to the ECU under demanding engine conditions
• Airflow-calibrated at the factory for out-of-the-box accuracy
• Upgraded internal components provide reliable circuit performance and protection against electrostatic discharge (ESD)
• Custom-designed platinum RTD sensing element delivers stable readings across a wide range of ambient temperatures
• Thicker housing walls for improved durability in harsh underhood environments
• Direct OE replacement — plug-and-play fitment with no modifications required

Cross-references OEM part number 078 133 471 C (Audi/VW). Also cross-references: Delphi AF10176, Delphi AF10491, Spectra Premium MA129, BWD MA1077, Walker Products 245-1202, Cardone 74-50029, and Duralast DL-6050. Sold individually.