Q7 Quattro V6-3.6L (BHK) (2007)
wash windshield" is sent via Comfort CAN-Bus system) => Vehicle Diagnosis, Testing and Information System VAS5051 in the "Guided Fault
Finding" function.
If the function of Air Quality Sensor (G238) is OK for this test and there is a customer complaint continue as follows:
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Check dust and pollen filter for dirt => [ Dust and Pollen Filter Element ] See: Heating and Air Conditioning/Cabin Air Filter/Service and
Repair/Dust and Pollen Filter Element.
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Connect fault read-out device and select the "08 Read measuring value block" function.
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Since the displayed values are read out while vehicle is driven, a second mechanic is required (observe safety precautions.
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Enter display group number "023".
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Drive vehicle to area with relatively clean ambient air (system operates in fresh air mode).
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Now drive vehicle into an area with heavily polluted ambient air (e.g. on a street construction or truck traffic).
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Read indications shown in display fields "3" and " 4". Indication in display fields "3" and "4" must change e.g. when driving through a diesel
exhaust cloud.
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Also note descriptions of dust and pollen filter => [ Dust and Pollen Filter ] See: Heating and Air Conditioning/Cabin Air Filter/Service and
Repair/Dust and Pollen Filter and functions of Air Quality Sensor (G238) => [ Function of the Air Quality Sensor ] See: Heating and Air
Conditioning/Description and Operation/Function of the Air Quality Sensor.