A8 Quattro Sedan V8-4.2L (BGK) (2006)
vertically out of the retainer on the windshield beginning at the edge of the window.
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Carefully remove the cowl grille from the locking mechanism on the windshield.
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Remove screws - arrows -.
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Detach both retainers and engine control module from plenum chamber electronics box.
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Set aside Engine Control Module (ECM) 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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Release fasteners - arrows - and lift off auxiliary relay carrier in electronics box.