The protective sensor is the oil pressure gauge or warning light. Never heard of anything else. If it was low on oil, it should have made a lot of rattling noises from the lifters before it spun engine bearings or seized a piston. Try turning the engine by hand. If it's free, you need to diagnose the starter system. If it will not turn by hand, plan on a total rebuild including a crankshaft, camshaft(s), lifters or rocker arms, pistons and rings, etc. It might be less expensive to find a good used engine from the salvage yard.
caradiodoc
Mar 26, 2009 at 2:25 PM