S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Secure reservoir of ATF filler tool (V.A.G 1924) as high as possible on vehicle.
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Remove ATF inspection plug - arrow B -.
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Guide filler hook of ATF filler tool (V.A.G 1924) into an opening - arrow - of protective cap, and while doing so, do not push cap up.
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Add ATF using ATF filler tool (V.A.G 1924) until ATF drips from the inspection opening.