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my 2009 focus has a satelite radio and Sync button but there is no module or option installed that enables access to either. I know I need a ECN # to report to Sirius  for service and am trying to determine how to verify or obtain the part needed and weather it is something that requires a dealership to install.  

quoted from: jpcarpages.com
Options for S include Sirius satellite radio ($195),  
Ford's Sync entertainment and communications system is available on the Focus. Developed with Microsoft, Sync provides a hands-free link to cell phones and MP3 players through a series of voice commands.  Sync in-car communications and entertainment ($395)