Sonata 2011 Owners Manual

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Suspension mounting bolts
Check the suspension connections for looseness or damage. Retighten to the specified torque. ...

Audio System
NOTE: If you install an aftermarket HID headlamp, your vehicle's audio and electronic device may malfunction. ...

Full-time 4WD operation
(If installed) Engine power can be delivered to all wheels. Full-time 4WD is useful when good traction is required, such as, when driving on slippery, wet or snow-covered roads and when moving out ...