Disconnect the grey & green elec plugs.
Remove the screw(blue circle) for the lead holder.
Undo the 3 bolts(red circles).
Pull valve assembly away from engine & inspect the filter that lies between this assembly & the cylinder head.



If the filter is clean,remove the 3 bolts below so u can take the solenoid off the valve assembly & make sure the valve moves freely with your finger.
Inspect the o ring u find in here as well,replace/clean if necessary.



To replace,
Torque all the bolts back in evenly to 12Nm,making sure the o ring & filter are seated correctly in both cases.

Make sure your solenoid(grey plug) is reading between 15-30ohms between plug & engine block before u remove the whole thing from the motor.