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OMEGA 2002 CD 2.2 - GEAR SELECTION PROBLEM - Mac12

With the engine off, gear selection is fine. When the engine is started, first and reverse gears won't engage. Could this be a clutch/DMF problem or something else?

If clutch, is it possible to fix a standard clutch kit to the existing DMF?

OMEGA 2002 CD 2.2 - GEAR SELECTION PROBLEM - Peter.N.

This problem is almost certainly due to the clutch not disengaging properly, presumably you are having to push the pedal right down to the floor. I assume its a hydraulic system which means you can't adjust it, but its worth checking the system first before blaming the clutch itself, some clutch slave cylinders are inside the clutch housing so it has to come off anyway.

I don't really know the system on this car so maybe someone else can give you more information.