Humidity Sensor In Fresh Air Intake Duct -G657- /Air Quality Sensor -G238-, Removing And Installing: Installing
WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Install in reverse order of removal and note the following:
- So that with the plenum chamber cover -A- installed no water flows via the intake box -B- in the heater and A/C unit, the plenum chamber cover -A- and the outer cover (rain water drain channel) -C- must not be damaged. In addition the plenum chamber cover -A- must be correctly and completely engaged in the lower windshield frame -D-.
- So that no foreign objects (for example leaves) enter in the intake box -B- the intake grille must not be damaged. Check it.
- Depending on the version, for some countries with high dust levels (for example China), a dust filter is installed in the filter mount instead of the grille. This dust filter prevents pollen and sand from getting sucked into the Fresh Air Blower -V2-. Allocation. Refer to the Parts Information.