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Q:

spark plugs on 2003 Jeep Liberty

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how to change spark plugs
(1) Answer
You did not mention which engine you have.

The V6 requires removal of each coil-on-plug to remove the spark plug.

The 4 cylinder requires the removal of the air cleaner housing, the ignition wires and the throttle body (to get to the #2 and #3 plug).