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The 166 has a Blaupunkt or Bose-badged unit with a BP serial number; the ICS navigation screen uses the same code.
Remove the radio and read the BP serial number from the label.
Remove the radio with DIN release keys
Note the full BP serial number
Enter the serial number when placing your order
Enter the received 4-digit code
The ICS display version uses the code of the radio module behind it — same BP serial
166 936 (1998-2007)
£12.99