Mass Air Flow Sensor - Function: measures the mass of air entering the engine and sends data to the ECU to control fuel delivery and ignition timing. - Why you need it: Accurate air flow data is essential for proper air-fuel ratio, idle stability, and throttle response. A faulty or worn MAF sensor can cause rough idle, hesitation, reduced fuel economy, or higher emissions. - Benefits: improves idle stability, smooth acceleration, and fuel efficiency; supports correct emissions control and engine performance. - Key attributes: compact sensor for engine management integration; item weight 0.11 pounds (about 50 g). - Use scenarios: 1) Replace a failing MAF sensor during routine maintenance to restore engine performance. 2) Diagnose and fix issues like rough idle or hesitation by restoring accurate air flow data. 3) Include in engine service or tune-up to ensure precise air measurement and optimal fuel trim.