Why does my 2010 Santa Fe engine continue to run after key is turned off?

If your 2010 Santa Fe engine continues to run after the key is turned off, it could be due to a phenomenon called "dieseling" or "run-on," which occurs when the engine is still receiving fuel and air, often caused by carbon buildup, overheating, or a malfunctioning ignition system. Another possibility is a faulty ignition switch that is not properly cutting off power. It's advisable to have a mechanic diagnose the issue to prevent potential damage to the engine or electrical system.