Hyundai Elantra سمارت 2016 Used Automatic Gasoline mileage: 300 KM or more Peace be upon you. The car works, there is nothing wrong with it. It has a sound. I took it to more than one workshop, and they said it's the air valve for the engine only, and the driver's airbag is old and came out, so I fixed it. Not inspected or renewed for about 3 years.