Quote Originally Posted by John_D
I'd be getting it to a mechanic ASAP. Oil pressure would naturally be lowest when warm and idling hence why the problem reveals itself when warm and at idle. I suspect you have a problem with your oil pump or something related. You could be doing serious damage to your engine when this is happening.
I've been googling around and the problem seems common enough.

I've read all sorts of solutions from the drastic (engine change) to the not so drastic (sensor problems)

this is the most hopeful thing i read on another forum

"After sleeping on it, I decided to give the oil pressure switch electrical connector a good cleaning. I reasoned that if the connector had oil leaking into it for a while in a hot engine compartment, that the connector may have gotten a coating of oil effectively baked on to it. This time, I used a good quality electrical contact cleaner, and put the connector on and pulled it off the switch a half dozen times to hopefully rub off any oil or corrosion that had accumulated on the connector.

I took the car out for another test drive, getting the oil warm, and eureka, the problem was solved! The red oil pressure light was no longer coming on, even after doing an extended drive on the highway.

So, for anyone who is having this issue, make sure the electrical connector to the oil pressure switch is well, and properly, cleaned. Our cars seem rather sensitive to this."