The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
input-turbine speed sensor circuit malfunction
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
Check the egr valve.
the check engine light comes on for many reason or many parts usally emmision related.
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.