One problem related to engine has been reported for the 2004 Mitsubishi Lancer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mitsubishi Lancer based on all problems reported for the 2004 Lancer.
Whenever driving, my vehicle suddenly stops accelerating over 2500 rpm's. When on the highway, it causes my car to drastically slow down, and I am forced to quickly move to the side of the road to avoid a collision. Dealer has replaced the app sensor on the vehicle twice already within several months, and is currently replacing it a third time. Very dangerous when on the highway.