Check engine light doesn't work

Check all the fuses for the instrument panel lighting.

Check all the light bulbs behind the instrument panel.

Replace all burnt fuses and light bulbs.

It could well be a break in the printed circuit behind the instrument panel or a dirty connection.

There are small replaceable bulbs behind the instrument cluster, they are installed in twist lock sockets usually, you have to pull the instrument panel to change them, #194 is a common dash bulb

You must remove the cluter of gauges and replace the light bulb.
Instructions

• 1Turn off the engine of the Taurus, and open the hood.
  
• 2Remove the negative ("-") battery terminal from the battery in the engine compartment using a socket wrench.
  
• 3.
  Insert a slotted screwdriver between the covers on the steering wheel column, and pry upwards. Pull off both the upper and the lower covers.
  
• 4Position the steering wheel as low as it can go.
  
• 5Remove the two screws above the Taurus' instrument panel and the four screws below it using a Phillips screwdriver.
  
• 6Insert a slotted screwdriver into the dashboard trim, and pull upwards to pry it off the vehicle. Disengage the eight snap clips from the dashboard trim by hand, and pull it out of the vehicle.
  
• 7Uninstall the two securing screws from the instrument panel with a Phillips screwdriver.
  
• 8Pull the instrument panel towards you, and reach behind it to disconnect the two wiring plugs. Pull the instrument panel out of the Taurus.
  
• 9Replace any burned-out bulbs from the underside of the instrument panel with new bulbs. Pull the old bulb off, and push the new bulb in.
  
• 10Reassemble the instrument panel and dashboard trim in the reverse order of removal. Reconnect the battery, and close the hood.
  

Try scanning the PCM connecting at OBD scanner reader tool.

Bulb is bad , no fuse problem . need to pull instrument cluster to replace the bulb . How To replace Instrument Panel Light Bulbs 2000 06 Chevy Suburband and...

change the flasher unit, located behind the fuse panel on the drivers side foot kick panel , then check the bulb of the bad light, with a Meter,, you could have a bulb filament flopping around and it looks to be good , also check that the base of the bulb is clean and has good grounding

You have a bulb in the rear of your car that is blown. Try turning the car off then back on without pressing the brakes. If the light does not come on, press your brake pedal down and then check to see if the light appears again. If it doesn't, your brake lights are okay. Next turn your park/headlights on. If the light appears in the panel, you have a blown rear bulb. The light will come on if any of the rear bulbs are blown so you will have to visually check it while the lights are on to see which one is defective. It's best checked at night or right before sunset so you can easily see which bulb needs to be replaced.

In order to change the back light bulbs you must remove the cluster from the dash.

It seems that the bulbs went out or the ribbon cable that runs behind the instrument panel burned out check on a junkyard for a replacement instrument panel and replace it, verify that the truck you pull out the instrument cluster is the same year and the same model.