A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
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possible. However, if it is necessary or desired to switch the function off, observe the following:
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The activated charcoal layer in the dust and pollen filter will become saturated after a certain amount of time
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A saturated filter cannot absrb any more pollutants so they will enter the vehicle.
The basic task of the activated charcoal insert in the dust and pollen filter and the air quality sensor -G238- is to keep peak loads out of the passenger
compartment. Keep the following in mind:
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If a vehicle is driven in an area with relative clean ambient air (with little gaseous pollutants in the air), the change over from fresh air mode into
recirculating mode at a different time then when travelling in an area with high constant level of pollutants..
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The switch from fresh air mode to recirculation mode always takes place whenever the amount of pollutants increases, regardless of what the
constant level is (e.g. when driving in the exhaust cloud of a diesel truck).
