Sporadic oil light at warmed up idle, then a check engine light

[BobMarley1]

My car flashes the oil light when idling, engine is warm. When it is cold it doesn't, due to the higher rpms.

What is the rpm for idle, warm engine.

I checked the oil level, it's fine. I disconnected the battery to get rid of the check engine light, and it hasn't returned, but the oil light still pops on occasionally.

Yes, I searched.

Any ideas?

Thanks!