That ticking noise can be a little unsettling, and it might take some investigative work on your part to find the cause. Some reasons behind a Hyundai Sonata’s ticking noise include low engine oil level, low oil pressure (which is often caused by a low oil level), or a problem with the ignition system. Another possible cause could be an exhaust leak.
Start by checking your engine oil level. It might be time for a top-off or even an oil change. If that doesn’t do the trick, make sure your gas cap is snug and in good shape. If you still hear the ticking noise, see if you can locate an exhaust leak.