Humidity Sensor: Description and Operation

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

• The Humidity Sensor In Fresh Air Intake Duct - 3 - needs about 2 minutes to reach its operating temperature after the ignition is switched on. During the warm-up phase, function is limited.






• 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. Check using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.