- Mass air flow sensor, also known as an air flow meter - Part numbers: model 0 280 217 520 (0280217520); associated code 4660817 (46 60 817) - Function: measures the mass of air entering the engine to provide accurate data to the control system - Why you need it: precise readings support reliable starting, smooth idle, consistent performance, and efficient fuel delivery - Compatibility: designed for use wherever this MAF sensor is specified; verify fitment with your vehicle or engine control unit using the above part numbers - Performance: delivers accurate measurements under varying operating conditions to help the system optimize air-fuel balance - Use scenarios: - Replacing a faulty MAF sensor in a gasoline engine to restore throttle response and idle stability - Routine maintenance for a fleet vehicle to maintain fuel economy and emissions compliance - Diagnostic work to confirm air flow input when troubleshooting engine performance issues