One problem related to check engine light on has been reported for the 2004 Kia Motor RIO. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Kia Motor RIO based on all problems reported for the 2004 RIO.
Check engine soon light came on and there was not acceleration while in 1st gear. Replaced fuel injector harness. The dealer also replaced the air cleaner lid with a newly designed one, mass air flow sensor and tightened pin connectors.