Allroad Quattro V6-2.7L Turbo (APB) (2002)
Climate Control Exhaust Gas Sensor: Testing and Inspection
Sensor For Air Quality -G238-, Checking
Special tools and equipment
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VAS 5051 Vehicle Diagnostic, Testing and Information System with diagnostic cable VAS 5051/1
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Test gas D 007 855 A2
Test requirements:
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Vehicle is in 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.
Checking
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With ignition switched off, connect VAS 5051 Vehicle Diagnostic, Testing and Information System with diagnostic cable VAS 5051/1 to 16-pin
diagnostic connector on vehicle. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks" under "Heating and Air Conditioning",
See: Testing and Inspection
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Start engine.
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Check DTC Memory
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Select "Auto" operating mode on A/C Control Head -E87-.
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Press button -A- for "Automatic air recirculation" (LED in -A- button comes on).
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Wait 30 seconds (warm up time of sensor for air quality -G238-).
Indicated on display of VAS 5051:
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Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.
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Remove plenum cover.
Indicated on display of VAS 5051: