Ducati Monster 696 Owner's Manual page 118

Release the lambda sensor cable (L) from the tab (M)
on the tank flange cover.
Warning
Before removing the flange cover (16), make
sure the tank is empty and position a rag to collect
any spilt fuel.
Hold the fuel tank in a raised position and remove the
flange cover (16) by unscrewing the nuts (17).
L
M
Fig. 81
16
17
Fig. 82
119