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Bad news - there is no light bulb. The cluster is light using electro-luminesence, which means the entire thing needs to be replaced.
What kind of vehicle? The light is most likely behind the instrument cluster. The instrument cluster would have to be removed to gain acces to the bulb.
in the instrument cluster
remove the trim panel around the instrument cluster then remove cluster. On the back of instrument cluster are the bulbs just turn them half a turn and they come right out.
Pull out your instrument cluster and check the back of the cluster for any blown bulbs.
Which Yellow light, what does the symbol look like
you cant you have to swap out the whole instrument cluster. I just had the same problem with mine.
On the right side of the instrument cluster.
Please be more specific--there is no such thing as an "engine light". There is a Check Engine Light or Service Engine Soon light. You have to remove the instrument cluster to replace the bulb for this or any other instrument light.
If the instrument panel wonÕt light up, there may be a problem with the wiring. There may also be some fuses that are out.
The instrument cluster can be replaced. The connectors on the back of the instrument clusters are the same for all versions of that generation of the Ford Focus. There are however problems when doing this: -The odometer will show the miles from the old cluster. The milage is built in to the cluster, not the car. -Some panel lights (like the ABS light) may light up depending on your vehicle's options. It is sometimes possible (although usually relatively expensive) to have the cluster reprogrammed at a Ford dealership to correct these problems.
hopefully in the instrument cluster like every other vehicle ever made