Monster 659 Owner's Manual page 49

Entering the code:
E when you access this function, the first digit on the left will
flash.
Switch (1, fig. 10):
each time you press the switch in position B "▼", the
number increases cyclically in steps of one digit every
second;
if you press the switch in position A "▲", you can set the
second digit, which will start flashing. Each time you press
the switch in position B "▼", the number increases cyclically
in steps of one digit every second;
if you press the switch in position A "▲", you can set the
third digit, which will start flashing. Each time you press the
switch in position B "▼", the number increases cyclically in
steps of one digit every second;
if you press the switch in position A "▲", you can set the
fourth digit, which will start flashing. Each time you press the
switch in position B "▼", the number increases cyclically in
steps of one digit every second;
if you press the switch in position A "▲", you can set the
fifth digit, which will start flashing. Each time you press the
switch in position B "▼", the number increases cyclically in
steps of one digit every second;
press in position A "▲" to confirm the code.
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If the code has been entered correctly, the message CODE
and the code itself will flash simultaneously for 4 seconds.
The "Vehicle/engine diagnosis EOBD" light (8, fig. 4) will
turn off; The instrument panel then automatically exits the
menu, thus allowing "temporary" starting of the motorcycle.
If the error is still present, at the next Key-On the instrument
panel error and the inhibited status will persist.
If the code is not entered correctly, the instrument panel
returns automatically to the "COD" menu, displaying code
"00000".