Check that the circlip (3) and tongue (13) are present on the pump.
Fit the pump drive gear (12) on to the oil pump and secure it by installing the circlip (6) in its groove.

Insert the by-pass valve pump (17), the spring (16) and screw the plug (14). Tighten the plug (14) to a torque of 17 nm (min. 15 Nm - max. 19 Nm) (sect. 3 - 3, Engine torque settings) applying a medium strength threadlocker.

Disassembly of the oil pump
Refitting the oil pumpExhaust by-pass valve not working correctly
Fault codes
Dds: exvl diagnosis -> position error, potentiometer, short circuit to ground
or open circuit (s.C. Gnd or c.O.),
Potentiometer short circuited to vdc (potentiometer s.C vdc).
Dashboard: the error "exvl" (exhaust bypass valve) is shown on the service
display. The eobd warning ...
Refitting the filler cap
Position seal (18) in tank cap (10) as shown and reassemble following the
removal procedure in the reverse sequence.
In particular tighten the screws (17) to a torque of 3 nm +/- 10% (sect. 3 - 3,
Frame torque settings).
...
Crankcase halves
Bearing
Bearing holder bushing
Alternator-side crankcase half
Bearing
Circlip
Washer
Bearing
Sealing ring
Bearing
Retaining plate
Screw
Screw
Clutch-side crankcase half
Sealing ring
Bearing
Circlip
Bearing holder bushing
Bearing
Plug
Screw
Spacer
Bush ...