Scan tool, will give you a trouble code as to why the computer turned the check engine light on.
Have vehicle scanned to determine the problem
How do you reset engine light on jeep liberty diesel
Usually a problem in the emission system - have vehicle scanned to determine the problem
Try disconnecting the battery for about 10 minutes or have vehicle scanned to determine problem and have codes cleared
The engine computer controls the check engine light.
If it is not on, you do not have a problem.
Not to my Konwing
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.
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.
What engine light? If you are referring to the check Engine Light, then the computer has detected a problem that effects the emissions controls.
what is this code p1491 on 2003 jeep liberty
It looks like a little yellow engine.