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Q: 4wd warning lights on on 2004 Porsche Cayenne S

using diagnostic tools to diagnose, no fault code present.
vehicle can only select to low range, two option>gear reduction on or off, but cant select to ON ROAD drive. after select to ON ROAD drive, instrument cluster comes out ''4wd system fault''
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You will need to get the codes read out from the all wheel drive system, which your scanner may not be capable of.
i have replaced transfer case encoder motor and the range selection switch at the center console, they are working find...but the problems still exist...
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