There is about 50 things that can turn it on. Take it to Auto Zone and have the codes read free.
The check engine light, on your Hyundai Elantra can be reset by removing the fuse. Keep the fuse out for 10 seconds and replace it to its slot.
No the check engine light will not come on
Disconnect the positive battery cable for a couple of minutes.
take it to autozone and they'll tell you fro free
the check engine light comes on for many reason or many parts usally emmision related.
Your speed sensor might be broken. Check it for rust or broken plastic part that would let water get in. Usually means you need to replace.
Water in fuel? Have vehicle scanned to determine the problem
Check the battery in the remote.
The computer has detected a problem with the emissions system. Take it to a professional.
It means there is a problem with the emissions system. Seek professional help.
Transmission problems.
A flashing check engine light is usually an indication of a misfire.