What is the function of the mass air flow (MAF) sensor?

The mass air flow (MAF) sensor plays a critical role in the engine management system by measuring the amount of air entering the engine. This information is essential because it helps the engine control unit (ECU) determine the correct amount of fuel to inject, ensuring optimal combustion conditions. The precise measurement of air flow allows the ECU to maintain the air-fuel ratio within the ideal range, which is crucial for efficient engine operation, fuel efficiency, and meeting emissions standards.

In contrast, the other functions listed do not pertain to the MAF sensor. The regulation of exhaust gas temperature is typically managed by other components in the exhaust system such as catalytic converters or temperature sensors. The vehicle's audio system is controlled independently by the radio or multimedia unit, and tire pressure levels are monitored by tire pressure monitoring systems (TPMS), which are entirely separate from engine air intake measurements.