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Have a mechanic or shop put a mechanical oil pressure gauge in the oil pressure sending unit's mounting hole. Check oil pressure against the spec for your car. Does the warning light turn on every time this happens? If so, try to check oil pressure when the light is on-you may have an intermittent oil pressure problem, or oil pressure may just be too low. Don't believe it's a sensor, don't know how, but not familiar with your newer ride. Something as simple as a pick up tube gasket that leaks could cause low oil pressure. If that happens, the top end of engine will clatter-not getting enough oil up there.
is there no pressure on the gauge is reading no pressure if you had no oil pressure the engine would be ticking and clattering they do have problems with the sending units replace that if the engine not noisy
Knocking in engine and low oil pressure usually means bad main bearings. May have been caused by bad oil pump or just worn out bearings due to high mileage. If this is problem needs engine or rebuild old engine.
The engine needs to be replaced. Clatter can be the main and rod bearings or the lifters. Lifters clatter with no oil pressure. Low or no oil pressure is usually bearings. Oil pumps rarely go bad, they are a very simple set up And work forever. I have never replaced a pump because it was bad. And running an engine for 30 seconds would not do that kind of damage. But running a long time low on oil will.
YOUR OIL PRESSURE SHOULD COME UP QUICKLY AFTER THE ENGINE IS STARTED. IF THE ENGINE IS CLATTERING THE THE PRESSURE IS LOW AND YOU MUST FIND THE CAUSE OR ENGINE DAMAGE WILL RESULT. IF YOU NORMALLY HAVE GOOD OIL PRESSURE CHECK THE PRESSURE SENDING UNIT. IT MAY HAVE GOOEY OIL DEPOSITS PLUGGING THE PASSAGE. OR, IF YOU HAVE ACCESS TO A MECHANICAL GAGE CONNECT IT TO THE OIL PORT AND GET AN MECHANICAL PRESSURE CHECK.
you need to have someone check the oil pressure to see if it is actually losing pressure or if sending unit is going bad. this is done with a mechanical gauge. Or you can just replace sending unit this is about a $20 part so cheap enough to just try. If you are actually losing pressure then you have scored bearings on the crank shaft. If not too bad can replace main bearings and a new oil pump.