| Checking air quality sensor -G238- / humidity sender in fresh air intake duct -G657- |
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| Different versions are fitted depending on the vehicle production period and the type of air conditioner („Basic“ or „Deluxe“) → Chapter. |
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| -G238- is only fitted on vehicles with air conditioner of the „Deluxe“ type. |
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| -G657- is only being gradually introduced on vehicles as of Model Year 2012. → Chapter |
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| After switching on the ignition, -G238- and -G657- need roughly 2 minutes to attain operating temperature. The function of -G238- and -G657- is restricted during the warm-up phase. |
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| Under certain ambient conditions, an air quality sensor -G238- fault message may be displayed during the warm-up phase. The air quality sensor -G238- is only to be replaced if the entry indicates that the air quality sensor -G238- is permanently defective. If the fault display for the air quality sensor -G238- switches from „static“ to „sporadic“ after switching the ignition off and on again (wait at least 2 minutes in each case), the air quality sensor -G238- is OK and the event recorder entry can be ignored (erase event recorder) → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. |
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| Operation of -G657- can only be checked by way of the „Guided fault-finding“ routine in which the measured values of -G657- are evaluated by way of the „Reading measured values“ function and compared to the temperature and humidity measured at the fitting location of -G657- → Vehicle diagnostic tester function „Guided fault-finding“. |
| Special tools, testers and other items required |
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| Vehicle diagnostic, testing and information system -VAS 5051- with diagnostic cable -VAS 5051/5A- |
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| Commercially available gas cigarette lighter (for checking -G238-) |
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