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The only code that I know of on any of the Porsche vehicles with replacement of the head unit, you get a communications error that does not show up on the cluster and it is in the HVAC. However, i use a PIWIS to program the PCM or CDR out of the vehicle.
The only possible scenario that I can think of is that they maybe bent the pins when plugging the switch back up, wires are chaffed on the shifter, they tagged the wrong wires, or they blew the fuse to the module when plugging it back in which would explain no communication with the module. I hope this wasn't Benchmark Motoring doing this if you are in the Seattle area, they would be the only ones I would trust a vehicle with in the area
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