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Re: low oil pressure light came on and hard knocking.
If your getting knocking, don't start it. Have someone look for proper oil filter, and double check level. Something they did has done some damage, by the sounds of it. If you don't trust them, have it diagnosed by another mechanic & report to them what was found. Let us know.Keep all your receipts & mileage when oil changed etc.
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The oil light comes on when the oil pressure sensor detects low oil pressure. The amount of oil has little to with it, although very low oil levels can cause loss of oil pressure. Since you aren't getting knocking, chances are the oil pressure sensor is defective. Replace it and monitor the situation closely. This could be a serious condition if allowed to escalated and it turns out to be an oil pressure issue.
I am going to assume you have checked the oil level to make sure the engine has enough oil. If it really is a warning light for low oil it could be that the shop knocked the wire off the sensor. If it is the warning light for low oil pressure, it could be the sensor or you could really have low oil pressure and still have plenty of oil.
1. Check your oil level. If oil level is not ok, correct oil level and find out why oil level was low and correct the problem. (Leaks, bad PCV, Burning oil due to severe engine wear, nobody has bothered to check it for the last 3000 miles, WAY overdue for an oil change, etc.) If oil level is ok, proceed to next step.
2. Remove the oil pressure sensor and install a manual oil pressure gauge. Run engine to verify low oil pressure. If gauge shows that the oil pressure is low, overhaul or replace engine. If oil pressure is ok, replace oil pressure sending unit and retest.
A bad oil pump could cause this but i would double check the oil level when the engine is hot on a level surface. That light usually only comes on when you have a low oil level and make turns starving the oil pump.You should do an oil pressure test to make sure it is the oil pump.
However seeing that it only comes on when you take hard turns, it makes
me believe that is may be an exposed wire that grounds out when you make
a hard turn
Rattle or knock, light knock is sign of a worn wrist pin on a piston. A tick is a valve lash adjustment and a rattle or hard knock may be a worn main bearing. I had a chevy which had a bad wrist pin and I just cleaned a spark plug once a week and changed it. Drove it for a year that way. Just keep up with the oil level and drive under 45 if possible.
First check the oil level and condition. Have your trucks oil pressure actually checked with a gage. It should be at least 42p.s.i. to 55p.s.i. The knocking noise is probably related to low oil pressure. Depending on the type of knock it could be crank shaft bearings, piston wrist pins, rod bearings, cam bearings or noisy lifters. All a result from low oil or pressure. 3 possible causes, are low oil level and pressure, lack of oil changes and viscosity of oil breaks down to where it can't lubricate or dissipate heat and coolant getting into oil, reduces pressure and prematurely wears down bearings. Have it properly diagnosed before you seize your engine solid.
Generally three things can turn the light on. First is the sending unit itself if it's going bad. Next is an obstruction of the pump pickup screen (usually hard carbon deposits). Third is worn engine bearings (usually rod bearings). Best way to find the problem is to have someone put a mechanical pressure gauge on the engine and read the actual pressure. If it's low you need to go into the engine to determine why. if it's normal, replace the sending unit. Senders aren't terribly expensive and you could just buy one and replace the one you have, providing the engine isn't tapping or knocking.
First, check the oil level (as you did).
If low, add immediately.
If car is relatively new, your PVC valve may have stuck open drawing the misted oil to the intake and burning it with very little tell tail smoke, this would resolve missing/low level oil issue.
If you don't understand the system, take it to your dealer.
You could loose the engine with low oil pressure.
Most pressure sensors open at 5PSI turning out the light on your instrument panel.