S6 V8-4.2L (BBD) (2004)
Climate Control Exhaust Gas Sensor: Service and Repair
Sensor For Air Quality -G238-, Removing And Installing
NOTE:
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The Sensor for air quality -G238- is a highly sensitive electronic component which can be damaged if it comes in direct contact with solvents,
fuels or chemicals (e.g. impurities may enter through area -A-).
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Do not install sensors that were previously improperly stored e.g. in tool boxes etc.
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Do not store removed sensors in areas that are contaminated with solvents, fuels and certain other chemicals (fluids or gases).
Removing and installing
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Remove plenum cover.
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Disconnect harness connector -A- from sensor.
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Disengage locking mechanism -B- and push sensor -C- down.
Terminal assignment in connector -A-
1
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B+ (Terminal "15")
2
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Ground (Terminal "31")
3
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Signal wire to A/C- control head -E87- (square wave signal cannot be measured)