One problem related to emission control has been reported for the 2003 Ford Ranger. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Ranger based on all problems reported for the 2003 Ranger.
Engine stumbles on acceleration. This has happened repeatedly, and the dealer in NY said there was nothing wrong. Owner/driver uses name-brand gasoline from a reputable dealer and is prompt about servicing vehicle. In a previous Ford, owner expericenced the same problem---solved by replacing sensor. This problem has nearly caused a motor vehicle accident and has been reported to both NY, CT and mt attorney generals. I wish this problem fixed.