I called up a couple of porsche dealers and i was told that diagnostic readout by the computer is not included in the PPI. in fact, i was told that even when the vin# is typed in their computer system it'll only bring up stuff done at THAT dealership only. i thought porsche had a system where if u type in a vin or hook up the car to a computer, it'll read out all maintenance & repair history... so PPI is merely a 1 hr visual inspection and roadtest. well i guess it's better than nothing