S4 V8-4.2L (BHF) (2004)
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From Confirm vehicle identification screen, select forward arrow ~ on navigation bar.
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Select vehicle system or function "Radio code -inquiry and system test'.
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Highlight vehicle system or function "Radio code, checking".
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Select forward arrow > twice on navigation bar.
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Read test description screen.
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Press "Done" button -arrow- to proceed with test.