A8L Quattro Sedan V8-4.2L (BVJ) (2007)
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Detach both retainers and engine control module from plenum chamber electronics box.
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Move the engine control module to the side with the connectors still connected.
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Turn air quality sensor (G238) - item 1 - counter-clockwise 90° and remove sensor from mount.
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Release the retaining clips - arrows -.
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Open plenum chamber electronics box cover slightly and pull off to front.
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Unplug multi-connectors - 1 -.