A bit more information would be useful, like how many miles are on the vehicle. If it isn't a high mileage vehicle, it might be a bad oil pressure sensor.
Check the oil sending unit.
first check your oil level. If that is full (8qts) and your low oil pressure light is still on then your piston rings are worn. I would recommend a top engine rebuild.
Check Oil Pressure Switch. It's about $60 at Toyota
You do not reset an oil light. If the light is on, then you have low oil pressure. It will go out when the oil pressure is sufficent. Check the oil level. If it is full, then you have a problem an should seek professional help. Do not drive this vehicle with the light on.
Check the oil level. If it is low, add oil to the full line before driving.
The check engine light does not generally have anything to do with the check oil light. The oil light just indicated it is time to change the oil, while the engine light indicates a problem.
Faulty sensor, or oil pressure issue. Sell the car, you'll replace your oil pan gasket at least twice.
No, oil level does not cause the check engine light.
bad pressure switch
this is for safety so engine does not get ruined,check oil level!!
It could be your oil sending unit has gone bad.
Your question is too vague. If you are talking about the Change Engine Oil warning, you have to read your owners manual and use the radio volume button to reset the engine oil life after you change your oil. A check oil light could mean you are low on oil. Fill up to 'full' line on dipstick and the light should go out. If you are sure the oil is Full and the light doesn't go off, there must be a sensor that senses the oil level is low.