Ford Pick-Ups/Bronco 1976-1986 Repair Guide

Emissions Maintenance Warning Light (EMW)



All light trucks with gasoline engines built for sale outside of California employ this device.

The EMW consists of an instrument panel mounted amber light imprinted with the word EGR, EMISS, or EMISSIONS. The light is connected to a sensor module located under the instrument panel. The purpose is the warn the driver that the 60,000 mile emission system maintenance is required on the vehicle. Specific emission system maintenance requirements are listed in the truck's owner's manual maintenance schedule.


  1. Turn the key to the OFF position.
  3. Lightly push a Phillips screwdriver through the 0.2 inch; diameter hole labeled RESET, and lightly press down and hold it.
  5. While maintaining pressure with the screwdriver, turn the key to the RUN position. The EMW lamp will light and stay lit as long as you keep pressure on the screwdriver. Hold the screwdriver down for about 5 seconds.
  7. Remove the screwdriver. The lamp should go out within 2-5 seconds. If not, repeat steps 1-3.
  9. Turn the key OFF.
  11. Turn the key to the RUN position. The lamp will light for 2-5 seconds and then go out. If not, repeat the rest procedure.

If the light comes on between 15,000 and 45,000 miles or between 75,000 and 105,000 miles, you'll have to replace the 1,000 hour pre-timed module.