To understand an oil-pressure warning that appears at hot idle, compare it under normal, safe conditions: cold versus warm, idle versus steady speed, and light versus higher load. Record engine temperature, idle speed, and whether the warning disappears when the engine is switched off. Change one condition at a time so the result stays useful.
Do not create a risky test just to reproduce it. Check the oil level only when safe and as the manual specifies; do not rely on a pressure switch guess.
Quick educational note
For information, not a diagnosis or repair instruction. Vehicle-specific checks are still required. Consult the manufacturer's guidance and a qualified technician.
How to use this information
This article explains general principles and does not establish what is wrong with your vehicle. Read the content limitations.