Audi 2.0T Red oil pressure light at idle

2012 Q5 2.0T with oil pressure light at idle,

1st attempt - new upgraded low oil pressure, camshaft bridge and oil pump.

2nd attempt - new crankshaft with bearings and balance shafts

3rd attempt - brand new cylinder head with another used camshaft 4th final attempt witch actually FIXED a problem- replacement cylinder oil spray jets