Air Quality Sensor -G238-, Checking: Notes

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NOTE:

Different versions depending on the vehicle date of manufacture and A/C system version ("Basis" or "Convenience"). Refer to AIR QUALITY SENSOR -G238-, FUNCTION .

The Air Quality Sensor -G238- is only installed on vehicles with the "Convenience" A/C system.

The Air Quality Sensor -G238- and the Humidity Sensor in Fresh Air intake Duct -G657- need approximately two minutes until they reach their operating temperature after turning on the ignition. The function of the Air Quality Sensor -G238- and the Humidity Sensor in Fresh Air intake Duct -G657- is limited during the warm-up phase.

During the warm-up phase, the Air Quality Sensor -G238- malfunctions may occur under certain ambient influences. Only replace the Air Quality Sensor -G238- if the Air Quality Sensor -G238- is repeatedly appearing as faulty. If the malfunction indicator for the Air Quality Sensor -G238- changes from "static" to "sporadic" after switching the ignition off and then on again (waiting at least two minutes each time), then the Air Quality Sensor -G238- is OK and the DTC memory entry no longer needs to be monitored (erase the DTC memory) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

Special Tools And Equipment

Vehicle Diagnostic Tester with the Vehicle Diagnosis System - Updated Cable - 3m:VAS5051/5A
Commercially available gas lighter (for checking the Air Quality Sensor -G238-)

Test Requirements:

Vehicle standing in a clean atmosphere (away from running engines, exhaust vents, etc.)
Engine compartment and the plenum chamber are clean (not contaminated with oil or fuel)
The engine compartment and the plenum chamber were not sprayed with cleaning agents or preservatives containing solvents
"Automatic recirculating air mode" is switched on.

NOTE:

It is possible to switch the "automatic recirculating air mode" on or off via the "A/C System" in the "Car" menu in the MMI (Multi Media Interface). Refer to the Infotainment/MMI Operating Instructions.