2005 Kia Optima ticking noise

You need a live person to listen to the noise. There's no way to diagnose this over a computer, especially when there's no details, observations, or clues to work with. The noise could have a dozen different causes from a simple serpentine belt coming apart, to a rattling timing chain. You didn't even list the engine size when asking an engine-related question so I can't tell if your engine uses a belt or chain. Low oil pressure can cause lifters to rattle but not all engines use lifters. Even an exhaust leak can cause a ticking noise.