What is this sensor

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your vehicle. The sensor near the air filter on the intake in your G37 is likely the Mass Air Flow (MAF) sensor. This sensor measures the amount of air entering the engine, which helps the engine control module adjust the fuel-air mixture for optimal performance. If you're experiencing issues, it could affect engine performance, fuel economy, and may trigger a check engine light. If there are any symptoms like rough idling or poor acceleration, it's best to have it checked by a professional. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!