I've been searching for the codes for my Sony CDP-CX455 without any luck, I have found a few posts that speak of this unit but I haven't found the actual codes.
Any help would be appreciated, thanks in advance.

Download and import the CCF file from the first link on this page.

[Link: remotecentral.com]

It may not have all codes you need but you can investigate other function codes to determine what is what. It is my understanding that the discrete code for 'Track (hidden)' does not work on the 455 and you have to use >10.

Remember that you can use CCF files for the legacy Pronto Series with File->Import. See Help Text for more info, FAQ, or Philips website.

Lyndel