Astra oil problem no oil on cashaft z22e - Cars & Trucks

In what way is the oil a problem..?
does it keep saying there is no oil ?
if it is saying this there is three parts you need to check.
1. is the breather for the sump. ( pipe coming from the bottom to the top of the engine.. ( can become clogged with burnt oil )
2. the oil switch on the sump. ( check for water in the plug if is replace the seal)
3. you need to take off the cam cover and clean out the oil drains. ( burnt oil can block the drain holes).