I would try disconnecting the battery....that may reset the computer chip.
Scan tool, will give you a trouble code as to why the computer turned the check engine light on.
How do you reset engine light on jeep liberty diesel
When a check engine light comes on, it means that there are issues with the engine. It gets turned off when the person resolves the problem that caused it to turn on.
The engine computer controls the check engine light.
The same way you turned it on
It is not supposed to be on when engine is running unless there is a problem.
what is this code p1491 on 2003 jeep liberty
Use an OBD code scanner to find out why the computer has turned on the check engine light.
check your oil level?
The check engine light is reset with a scan tool after repairing the failure that caused the code.
If the check engine light is blinking that means an engine cylinder misfire has been detected
You reset it with an OBD2 scan tool after it is repaired.