A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Release retaining tabs - arrows - and remove both engine control modules (ECM).
‹› Electrical harnesses remains connected.
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Turn sensor for air quality (G238) approximately 90° counter-clockwise - arrow - and remove from retainer.
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Release retaining clips - 1 to 4 -.
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Fold the cover for the E-box in the plenum chamber open slightly and pull off toward the front.
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Disconnect multi-pin harness connectors - arrows - using spark plug connector pliers (V.A.G 1922).