Touareg V8-4.2L (BHX) (2004)
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Select Diagnosis function "07 - Code control unit".
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Change coding from "1" to "2".
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Finish coding by selecting the backward arrow <-- on navigation bar.
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Select Diagnosis function "06 - End output".
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Select Diagnosis function "00 - Collection services".
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Select "Check DTC memory - complete system". which will interrogate all fault memories.
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Erase ALL fault memories.
Once ALL fault memories have been erased:
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Install "Update - Programming" (flashing) CD W42TOUAREGTHCD in diagnostic tool.
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Select vehicle system "69-Trailer function".
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Select "Update - Programming" option at bottom of screen.
CAUTION!
Once "Update - Programming" function has been started, switching ignition OFF or disconnecting the diagnostic connector may completely
destroy the Control Module.
"Update - Programming" (flashing), performing