Define knocking. Is it knocking as in a deep thumping, or a tapping clacking higher pitched click?
Worst case scenario, deep thump MIGHT indicate a spun big end Connecting rod bearing which allows the connecting rod to knock back and forth on the crank. Mucho worst case.
Best case scenario, ticking might be as simple as a dirty fuel injector.
There are at least a dozen other things in between.
I wouldn't describe it as a high pitch sound, such as clicking. It's sort of a deeper pitch knocking, though not extremely deep. I wouldn't really say it's producing a deep
thumping. It seems to be a surface level sound like it's coming from the chain maybe. Also, no check engine light or any other warning indicators.