A8 Quattro Sedan V8-4.2L (BGK) (2006)
Climate Control Exhaust Gas Sensor: Procedures
Air Quality Sensor G238, Removing And Installing
NOTE:
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Air Quality Sensor G238 is a highly sensitive electronic component which could be destroyed by direct exposure to solvents, fuels and certain
chemical compounds (contamination can ingress by way of area - A - for example).
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For this reason, never install sensors which have been exposed to unsuitable environments.
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Following removal, do not set down sensor in areas where it could come into contact with solvents, fuels or certain chemical compounds (liquids
or vapors).
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There are various housings for the Air Quality Sensor G238, but the mode of operation is always identical
Removing and installing
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Remove plenum chamber cover on right.
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Unplug connector - A - from sensor.
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Turn sensor through 90° and lift sensor - B - out of mount.
Contact assignment in connector - A -
1. Positive (terminal "15")
2. Negative (terminal "31")
3. Signal wire to Climatronic Control Module J255; measured value is indicated in measured value block of Climatronic Control Module J255
(display group "022"); square-wave signal cannot be evaluated using workshop equipment