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The B-Class W245 has an Audio 20 radio with BE serial number.
Remove the radio for the BE serial number. Confirm the code with buttons 1+3.
Remove the radio
Read the BE serial number
Enter the serial number when placing your order
Enter the code and confirm with buttons 1+3
B-Class W246 (2011+) has NTG4+ — no separate radio code
B-Class W245 (2005-2011)
£9.99