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Scan tool, will give you a trouble code as to why the computer turned the check engine light on.

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Q: How do you diognose engine light problem on a 2002 Jeep Liberty?
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2003 Jeep liberty engine light comes on?

Have vehicle scanned to determine the problem


How do you reset check engine light on Jeep Liberty diesel?

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If it is not on, you do not have a problem.


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The check engine light comes on in a car when there is a problem with the engine. It will go off or be reset when the problem is fixed.


Does the radio lock when you turn off check engine light on 2004 Jeep Liberty?

I think you are assuming that to reset the check engine light you can just disconnect the battery. Disconnecting the battery on a 2004 OBD2 compliant vehicle will not reset the check engine light. It must be reset with an OBD2 scan tool. This would work on OBD1 vehicle but not on OBD2 vehicles. So the radio issue is mute. Have the problem that set the check engine light repaired and then reset the light with the tool. Reset the light without correcting the problem and the light will just come back on.


Why engine light came on?

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It looks like a little yellow engine.