Removed battrey then foundout i had no code in my cars papers my car is a secondhand ford mondeo 2003 with a sony six ganger fitted

The only alternative is trying all 99999 codes, if this dont work, you will need to contact Sony Either via the Web or their Customer Service line to get the Manual Reset Code for your specific model. Keep in mind that each Sony has a different unlock code so the Master may not work on certain models as is the problem with yours.

Additionally, could try the key combinations in here, they can unlock some Sony model and bypass the code request.

Also, coudl try in this links:
- radio-code.co.uk
- blueice-electronics.co.uk/codes

Hope helps.