Why does the oil light come on while idling?

the oil sending unit grounds out the dash light bulb as engine speed increases the pressure rises and turn light off normal idle hot oil pressure 30-40 psi. if low then engine bearings are worn.

You are low on oil, or your oil is too old. Check oil in the motor when the car has been sitting for at least two hours. The light usually doesn't flash until you are more than 2 quarts low. Change your oil.

Its ok...maybe change oil with a thicker oil, may help alittle...

Sounds like the oil pickup screen is clogged causing low oil pressure at idle. Oil pumps do not go bad in these cars.

Low oil, bad sensor, really low idle.
First check oil level.
then if oil level is ok, and oil light is still there, pay attention to idle has to be 750 to 850 RPM.

If idle ok, give gas to increase idle to more than 2000 rpm if light goes away you need a sensor called OIL PRESSURE SWITCH.

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its a high mileage engine.
all you need to do is use a thicker oil and the light will go out at idle speeds.

use a 50w sae valvoline racing oil.
plus stp oil treatment.

do that and that light is all gone.

When you give it gas or idle for awhile the pressure will build up to normal and turn off the light.

If you are consuming oil and coolant you should check your head gasket also.

Sounds like your oil pressure sensor may be faulty. Or your oil level is very low. Your engine should idle as low as 650 rpm without your light coming on.

your engine needs flushed .what is going on is idle has less pressure than driving and the sump is picking up dirt and debris but when you turn off or idle the debris falls off the sump.

A faulty gas cap can cause the sensor to come on.
Clean out the throttle body with a cleaner and see if the idle improves.