Before we look at causes of low oil pressure, a couple of suggestions. Make sure you are using the correct weight oil and the correct amount. In this vehicle it is more than likely 5w-30 and 4.5 or 5 quarts. Also remove the filter and install an AC/Delco filter. The AC/Delco is a highly rated filter and is all I would use in a GM vehicle. Make sure to use the correct filter. There are many causes for low oil pressure but the most common is engine wear. As the engine wears and gets sloppy, the pressure will drop. But this is a gradual process, it doesn't happen all of a sudden. If the oil pressure loss is sudden one, then we have to look at the oil pump and pressure relief valve. It is possible the pressure relief valve has some junk holding it partially open or the spring in it is weak or broken. Only taking it apart will reveal the answer. But before I do any of that, I would use a mechanical pressure gauge and get an accurate oil pressure reading. It could be a bad oil pressure sending unit or gauge giving you a wrong reading. If there is valve or engine noise when the pressure drops, then chances are it is a pump problem. One thing that will help is to use a heavier oil in the engine, say 10w-30. This won't cure the problem, but it will help for a while until the root cause can be determined.
Low or no oil pressure.
The 2001 Chevrolet Impala low side service port can be found on the top of the air conditioner compressor. The port will be labeled as the low pressure port.
The LOW pressure fitting is SMALLER than the HIGH pressure fitting.
On our Impala, it means that your tire pressure is low on one of your tires.
turn the parking lights on and off 3 times
what about the low beam?
It means you may be low on engine oil or need a new oil pressure sensor or worse a new oil pump.
Fill it up with coolant. If it gets low again I'm guessing you have a hole in your radiator. Replace it.
This is a diagnostic process. If the coolant isn't low and the fan will run when the AC is turned on it will need a Mechanic to Diagnose.
the promblem is the oil pump.
The 2002 Chevy Cavalier low side service port can be found on the top of the air conditioner compressor. The low side service port will be labeled as the low pressure port.
! If you want to turn it off turn the radio off and hold the DISP button for 10 seconds, this activates the setup menu. Scroll through until you see Tire Pressure and reset it. The car does not come with an active tire pressure management system, when it detects low pressure you will HAVE to reset the light.