AQS means Air Quality Sensor. It monitors pollution and automatically switches or changes the climate control system to its recirculate mode if smog levels start rising in the cabin.
If you activate the air quality sensor, it will not maintain recirculation for an extended period to prevent the air inside the vehicle from becoming too dry or stuffy. For vehicles with an air quality sensor, the climate control system adjusts to limit some exhaust fumes from being pulled inside your vehicle.
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