If the ticking is coming from the top of the engine it is likely the Hydraulic (valve) Lash Adjusters.
A fresh oil change using a quality oil and ***an OEM filter from the dealership*** should clear the noise up within 15 minutes of driving.
Use of a non-OEM filter can cause valve train ticking noise.
The 2001 Hyundai Elantra's came with the 2.0L engine
The 2001 Hyundai Elantra has an inline 4 engine.
The 2012 Hyundai Elantra has an inline 4 engine.
The 2014 Hyundai Elantra has an inline 4 engine.
The 2007 Hyundai Elantra has an inline 4 engine.
The 2010 Hyundai Elantra has an inline 4 engine.
The 2008 Hyundai Elantra has an inline 4 engine.
The 2001 Hyundai Elantra's came with the 2.0L engine
The 2006 Hyundai Elantra has an inline 4 engine.
The 2011 Hyundai Elantra has an inline 4 engine.
The 2003 Hyundai Elantra has an inline 4 engine.
The 2002 Hyundai Elantra has an inline 4 engine.