Operation CHARM
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1995
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A6 Quattro Sedan (4A2) V6-2.8L (AAH)
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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P Code Charts
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P1504
P1504
DTC P1504/17912
Note
: If DTC P1504/17912 is set, both output stages ("+" and "-") of the IAC valve N71 are switched OFF and IAC valve N71 operates in the limp-home mode.