[Britwrench]

If the car was tested at a Porsche dealer, any fault codes (and the relevant numbers) can be sent directly to Porsche AG for confirmation.

If it does need a DME, the new ones are not that expensive (related to the price of the vehicle) and will need programming. I only install new DME units on the rare instance of actually requiring replacing.

Dave is correct the engine and VIN do not match. PET will show if the engine numbers are within certain range for a specific VIN.
Porsche dealers can tell you the original engine number.