One problem related to service engine light on has been reported for the 2000 Ford Focus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Ford Focus based on all problems reported for the 2000 Focus.
While coming home from a house warming in tucson, az on 06/21/03 me, my 2 nieces,and my daughter were on the fast lane of the freeway coming out of tucson when the engine started losing power, the car started slowing down to about 25 mph we had to cross 3 lanes to get off the freeway with other cars coming at 65 to 70 mph we almost got hit on the last lane before exiting the freeway. The car then sputtered the rest of the way off the freeway. After sitting for a while we were able to start it again. And continue home but we used frontage rd all the way. I am afraid to take it on the freeway anymore. Sometimes it does want to start at all. The door on passanger side also doesn't unlock with power button. Service engine light comes on with battery light and oil light. I feel someone will eventually be seriouly injured unless they find out what is wrong here.