internal leak, how much to inspect? on 2006 Nissan Frontier

The oil switch was changed, but the light continues to come on how much to inspect inside of engine?

Asked by for the 2006 Nissan Frontier
you should drain your oil in a pan and look for metal. sound like you may have internal bearing failur or a bad oil pump. also chech the wiring harnes for the oil switch for shorted to ground.