Zero oil pressure and engine nocking noise

Unfortunately, this is not a good thing.

Basically, at this point we need to drain the oil and see how much metal is in the engine oil.

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

If there is metal in the oil, then unfortunately you most likely lost the oil pump and that has caused metal to metal on the crank bearings and the engine is now knocking.

If there is no metal in the oil, then we should look into the oil pump or other things that can cause this but if the pressure is 0 then you most likely have an oil pump issue.

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure

Let's start with this info and go from there.

Thanks