S6 Quattro Sedan V10-5.2L (BXA) (2007)
‹› If the Air Quality Sensor (G238) comes in contact with cigarette smoke or with gas from an ignitor, it will react since ignitor gas is heavier than
air; remove the Air Quality Sensor (G238).
Test procedure "2"
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Place spray head - A - of test gas bottle over air inlet of air quality sensor - B -.
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Press spray head - C - of test gas bottle for 1 second.
‹› There are different versions of the air quality sensor (G238), each with different functions. Make sure the allocation is correct.
‹› The test gas canister is filled with pure oxygen with a specific nitrogen oxide component.
‹› If cigarette smoke or cigarette lighter gas (gas is heavier than air, therefore remove the Air Quality Sensor (G238) and turn it around) acts on the
Air Quality Sensor (G238), it also reacts.
Continuation for both test procedures
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Read the display with the air quality sensor (G238) measured value and the recirculating/fresh air flap position => vehicle diagnosis, testing and
information system VAS 5051 in the "Guided Fault Finding" function.
‹› The specified value for the recirculating and fresh air door position changes from fresh air or partial recirculation mode when there is a request for
"Automatic Recirculation Mode". The request is fulfilled (the A/C system switches to recirculation mode).
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Wait a short period time (approximately 1 minute, depending on amount of test gas sprayed in sensor).
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Read the display with the air quality sensor (G238) measured value and the recirculating/fresh air flap position => vehicle diagnosis, testing and
information system VAS 5051 in the "Guided Fault Finding" function.
‹› The specified value for the recirculating/fresh air door position changes from recirculation mode to fresh air or partial recirculation mode (no