WARNING: This page is about a different car, the 2018 Audi A6 Quattro, 2017 Audi A6 Quattro, and 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
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-- Free up the fuel hose on the cylinder head cover.
-- Remove the bolts in the sequence -12 to 1- and remove the cylinder head cover.