A8 Quattro Sedan V8-4.2L (AUX) (2001)
Climate Control Exhaust Gas Sensor: Testing and Inspection
Sensor For Air Quality -G238-, Checking
Test requirements
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Vehicle is in an area where there is clean recirculating air (not near running engines, openings from exhaust systems, etc.)
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Engine compartment and plenum chamber are clean (not contaminated with oil and/or fuel)
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The engine compartment and plenum chamber were not sprayed with cleaning or preservative solutions
Preparation
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Check DTC memory.
If a DTC is recognized, repair and eliminate all malfunctions.
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Remove plenum chamber cover.
Checking
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Switch ignition on.
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Set A/C control head -E87- to "Auto" operating mode.
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Start engine (compressor on).
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Press button for "Automatic air recirculation" (lamp in -A- button comes on).
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Wait 30 seconds (warm-up time of sensor for air quality -G238-).