A8 Quattro Sedan V8-4.2L (BFM) (2005)
recirculating/fresh air flap position must change, for example when driving through a cloud of diesel exhaust.
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Also note descriptions, refer to => [ Dust and Pollen Filter ] See: Heating and Air Conditioning/Cabin Air Filter/Description and Operation and =>
[ Air Quality Sensor Function ] See: Description and Operation Air Quality Sensor (G238).