Why does the oil warning light on 2004 Mitsubishi Endeavor comes on only when idling?

The oil warning light on a 2004 Mitsubishi Endeavor may come on while idling due to low oil pressure, which can occur when the engine is not running at higher RPMs. At idle, the oil pump may not be generating enough pressure to circulate oil effectively, especially if the oil level is low or the oil is old and degraded. Additionally, a malfunctioning oil pressure sender or gauge could also trigger the warning light. It's important to check the oil level and quality, and address any potential issues promptly.