There is a light bulb behind the check engine light. The cluster pulls out using a special tool or you can make one by taking a piece of thin metal 3/8" wide and about 12" long and bending over one end to make a hook (very flat hook). Insert this gently on one side of the cluster and pull out this side. repeat on other side. You may want to get some bulbs before you do this (thet have a special base).