A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
Outside Air Temperature Sensor, Checking
Outside Air Temperature Sensor, Checking
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Pull the left rubber seal - B - as far as necessary.
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Remove the fresh air intake cover on the wind cowl - A - or the wind cowl (different styles).
‹› If necessary, carefully loosen the wind cowl from the windshield cross member - C -.
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With the ignition switched off, connect the Diagnostic Operation System (VAS 5051/) with Diagnostic Cable - 3 Meter (VAS 5051/5A) to the
16-pin Data Link Connector (DLC) of vehicle and perform the self diagnosis and Vehicle Diagnosis, Testing and Information System VAS 5051
in the "Guided Fault Finding" function.
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Start engine.
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Check DTC memory of A/C control head Climatronic Control Module (J255). Refer to Vehicle Diagnosis, Testing and Information System VAS
5051 in the "Guided Fault Finding" function.
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Set the A/C Control Head Climatronic Control Module (J255) to "Auto" ("Comfort" system).
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Using the MMI (Multi Media Interface) set "automatic air recirculation " in the A/C Control Head Climatronic Control Module (J255). Refer to
the Infotainment / MMI Owner's Manual.
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wait 2 minutes. (Air Quality Sensor (G238) warm-up time).
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Using Vehicle Diagnosis, Testing and Information System (VAS 5051) select "read measured values block " and then read the measured values for
the Air Quality Sensor (G238). Refer to the Infotainment / MMI Owner's Manual.
‹› The NOx- portion (nitrogen oxide) and the CO- portion (carbon monoxide) in the air measured by the Air Quality Sensor (G238) is displayed in
the measured values block; explanation for possible displays. Refer to the Infotainment / MMI Owner's Manual.
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Rotate the Air Quality Sensor (G238) - A - approximately 90° to the left and remove it from the fresh air intake - C -.