Hello,
It sounds like your oil sending unit is not functioning. When this goes out you lose oil pressure. When the oil pressure drops the oil does not circulate and then your engine does not lubricate and will seize up on you. That's the knocking you are hearing.The oil light is on because of the drop of oil pressure. I would stop driving that vehicle until that oil sending unit is repaired. If you do not repair this at home or where the vehicle is at the you will want to have it towed to the point of repair. You can test the oil sending unit with a pressure gauge beforehand too but it sounds to me like it is bad. Sometimes they are easy enough to switch out. If you give me your make and model and year of vehicle I can list the steps and location for you. Other wise have it towed to a mechanic. I would like to reiterate that you should not drive it anymore until it is repaired. The other thing that it could be is your oil pump. Either way stop driving it.
Regards,
Tony
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