See also:

Warning on the LCD screen (if equipped)
Key is not in vehicle If the smart key is not in the vehicle and if any door is opened or closed with the engine start/stop button in ACC, ON, or START, the warning illuminates on the LCD scree ...

Checking Engine Cooling Fan
The engine cooling fan should come on automatically if the engine coolant temperature is high. ...

WORLD CLASS POWER-TO-WEIGHT RATIO
One of the program targets for the 2011 Sonata engineering team was world-class power-to-weight ratio. Power-to-weight ratio pays dividends in both performance and fuel economy. Hyundai Sonata i ...