Hello so my holden berlina (commodore) had a check engine light come on i plugged in my obd2 and it said misfire on cylinder 4 as well as the poo16 code (Crankshaft Position-Camshaft position correlation Bank 1 Sensor A)

So i replaced all the spark plugs because im not sure which is cylinder 4 and cleared both codes.
after about 100km the poo16 code came back and not the misfire code.

I have cleaned the Mass Airflow sensor and put a new air filter into it.

I have Replaced both of the Camshaft position sensors.

I have cleaned the Actuator sensors they went too bad.

I cant test the injectors with a screwdriver because the intake is directly on top of the fuel rail

Any help is much appreciated thank you.

2007 Holden Berlina V6 A (commodore) 3.5L