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I have a 2004 3.2 cayenne. During replacing the prop shaft (thumping on down shift) the battery drained flat and required a re-charge. when connecting the battery and trying to start the car i got a "brake proprtioning" error, and the car would not start. having no luck called the breakdown service who tool my car to an auto electrian who attempted to find the fault. attaching a diagnostic machine i was told it was the ABS swicth or ABS module, switch replaced but no fix. ABS module sent away for testing came back clear (well the company say they couldnt fully test, needs a main dea