I had what I would call, a difficult ECU problem. I have a 2013 Porsche Cayenne Diesel. Not a very common vehicle, and one that I found to be not supported by several ECU repair services. Apparently they have limited access to Porsche ECU programs. I had already sent my ECU to two different ECU repair companies. One charged me a repair fee, which they refunded once I challenged their claim that it was repaired. It hadn’t even had the screws removed from the cover. The second company told me that it passed all their tests. And they charged me a testing fee. Finally, I bought a used ECU from EBAY. I sent this ECU and my old ECU to The ECU Pro. They were able to copy the information from my old ECU to my new ECU. I plugged in the new ECU, and my vehicle is running without issue. This saved me over a thousand dollars compared to the cost of a dealer ECU plus programming. I recommend these guys. I would use them again.