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MAF sensor measures the volume of air entering the engine. It does this by either directly measuring the volume of air passing through it or indirectly measuring it by measuring the temperature difference across a heated wire. MAF sensor sends a signal to the ECU, providing information about the amount of air entering the engine. Using the information from the MAF sensor, the ECU adjusts the fuel injection rate to maintain the optimal air-fuel ratio for combustion. This is crucial for engine performance, fuel efficiency, and emissions control. MAF sensors are vital components in modern fuel injection systems, allowing engines to operate efficiently across various driving conditions. If a MAF sensor malfunctions or fails, it can lead to poor engine performance, reduced fuel efficiency, and increased emissions. Common symptoms of a failing MAF sensor include rough idling, stalling, hesitation during acceleration, and illuminated check engine light..syi