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Do you have the gauge with the warning lights? Which lights are on?
So after the diagnostics all lights go off? But the buzzer stays on?
That should be low oil pressure. Since the buzzer really never turns off I suspect a faulty sender.
#18 is the oil pressure sender. Disconnect it and see if the buzzer stops with the key ON engine OFF. If so replace the sender.
Look at the attached picture of the block. #18 in the drawing. Not the fuse box.
I would definitely NOT use the engine with the alarm going off. We have no way of knowing if the engine actually has the required oil pressure, or another problem. Before using the engine we need to determine exactly what is happening and that we do have good oil pressure.
If it is just the sender then a simple replacement will do.