If you googled Ford 1.6 VCT P 0300 you see among others horrible Odyssians up to the replacement of VCT units, exhaust valve seals etc.
What I mean by this is that it requires a truly experienced specialist who knows these engines. Otherwise you might be lost and someone will repair the engine without a plan.
But sometimes the little things that you can do yourself at no cost can help with such a mistake.
E.g. I would carefully remove the contact plugs from the relevant visible parts, e.g. the camshaft sensors and the VCT hydraulics, I would also keep an eye on the coolant sensor via OBD2. The two oxygen sensors should also show good values when monitoring
Anything that could draw in wrong air I would check mechanically.
These engines are very sensitive to oil. If thicker than 5w30 the VCT may not work anymore properly.
