So That switch is definitely faulty.
>>>>> I tried the switch from the TT in the A4 it has 12V ignition on and goes to ground with engine running but warning light still comes on.<<<<<
And The switches are different part numbers. ?? (That could ring alarm bells )
Could it simply be that One of the switches is Normally closed and goes open circuit on startup. ( Yours ) and The one from the TT is normally open and closes on startup. ?
Try Earthing the wire out, Start the car and remove the wire from earth then rev it up to see if the warning is still present.
( Possibly after checking data as John suggested which could show OK or Not OK the wrong way around )
Hope I haven't muddied the waters. Tony.
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