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Home >> Audi >> 2012 >> A8 Quattro Sedan (4H2) V8-4.2L (CDRA) >> Repair and Diagnosis >> Heating and Air Conditioning >> Humidity Sensor >> Description and Operation >> Humidity Sensor In Fresh Air Intake Duct (G657), Checking
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Humidity Sensor In Fresh Air Intake Duct (G657), Checking






Humidity Sensor In Fresh Air Intake Duct (G657), Checking

• In this vehicle the Air quality sensor (G238) - C - and the Humidity sensor in fresh air intake duct (G657) - D - are combined in one component - A -.

• The humidity sensor in fresh air intake duct - D - requires approximately 2 minutes to reach its operating temperature after the ignition is switched on. During the warm-up phase, the function of the humidity sensor in fresh air intake duct is limited. Check using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.






• The function of the humidity sensor in fresh air intake duct can only be checked via Guided Fault Finding. The measured values of the humidity sensor in fresh air intake duct are evaluated via the read measured values function and compared to the temperature and humidity measured at the installation location of the humidity sensor in fresh air intake duct using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

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