Removing and installing

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Remove plenum chamber cover.

Version "1"

Fig 1: Disconnecting Connector From Air Quality Sensor G238 & Removing Bolt

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect connector - A - from Air Quality Sensor G238.
Remove bolt - B - and remove Air Quality Sensor G238.

Fig 2: Terminal Assignment In Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Terminal assignment in connector - A -

1 - B+ (terminal "15")

2 - Negative (terminal "31")

3 - Signal wire to operating and display module, Climatronic Control Module J255 (square-wave signal cannot be measured)

4 - Not used

Version "2"

Fig 3: Disconnecting Connector From Air Quality Sensor G238 & Releasing Catch And Sliding Air Quality Sensor G238 Downwards

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect connector - A - from Air Quality Sensor G238.
Release catch - B - and slide Air Quality Sensor G238 - C - downwards.

Terminal assignment in connector - A -

1 - B+ (terminal "15")

2 - Negative (terminal "31")

3 - Signal wire to operating and display module, Climatronic Control Module J255 (square-wave signal cannot be measured)