Humidity Sensor In Fresh Air Intake Duct -G657- /Air Quality Sensor -G238-, Removing And Installing: Notes
- There are different versions of the Air Quality Sensor -G238- /Humidity Sensor in Fresh Air Intake Duct -G657- -A-. Therefore, ensure the correct allocation. Refer to the Parts Information.
- The Air Quality Sensor -G238- (with Humidity Sensor in Fresh Air Intake Duct -G657-) is only installed on a vehicle with a "High" A/C system. Refer to the Parts Information.
- On a vehicle with a "High" A/C system a sensor -A- is installed in which the Air Quality Sensor -G238- -C- with the Humidity Sensor in Fresh Air Intake Duct -G657- -D- are combined in a single component. Refer to the Parts Information and the Audi Sales Program.
- On a vehicle with a "Low" A/C system (or without an A/C system only a heater) only a sensor -A- with a Humidity Sensor in Fresh Air Intake Duct -G657- -D- but without an Air Quality Sensor -G238- -C- is installed. Refer to the Parts Information and the Audi Sales Program.
- Depending on the vehicle version, there are different fresh air intake versions. Refer to the Parts Information. Depending on the version of the fresh air intake the component location of the Air Quality Sensor -G238- (with the Humidity Sensor in Fresh Air Intake Duct -G657-) -A- is different. Refer to FRESH AIR INTAKE, REMOVING AND INSTALLING . These and the following illustrations show the Air Quality Sensor -G238- (with the Humidity Sensor in Fresh Air Intake Duct -G657-) -A- on a fresh air intake in the version which was installed at the start of production.
- Sensor -A- (combination sensor with the Air Quality Sensor -G238- and the Humidity Sensor in Fresh Air Intake Duct -G657-) is a highly sensitive electronic component that can be damaged if it comes in direct contact with fluids, solvents, fuels and certain chemical compounds (for example, contaminants can enter through area -C- or -D-). Moreover, the function of the Humidity Sensor in Fresh Air Intake Duct -G657- can be severely affected by direct contact with water so that correct moisture values can no longer be measured (briefly or permanently depending on the composition of the fluid). For this reason, do not install sensors that may have come into contact with these substances.
- Following removal, do not set down the Air Quality Sensor -G238- /Humidity Sensor in Fresh Air intake Duct -G657- in areas where it could come into contact with solvents, fuels or certain chemical compounds (liquids or vapors).