Sorry but the codes did not work. I also tried 2740, 2741, 2742, 2743, 2744, 2739, and 2738. Those did not work either.
In addition my radio is actually CDR-210.There is also a number when i take the radio face out. That number is 228012516272189905.
Is there any other information you need? Are there any numbers you would suggest?
Thanks a lot again in advanced!
EDIT--- My car is also a 1999 Porsche C2. The manufactured date was in July 1998. It is a US car if that helps as well.