Two problems related to check engine light on have been reported for the 2003 Mitsubishi Lancer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mitsubishi Lancer based on all problems reported for the 2003 Lancer.
Engine light went off. P0300 code. I've went back to the dealers for more than 3 times for this very same code. They've done a ecu reflash for me and they swapped the fuel injectors as well. The engine light still went off very often with the same p0300 code.
P0300 multi-cylinder random misfire. After many attempts made my Mitsubishi, this problem has never been fixed. On average, this happens 3-4 times daily, everyday and hinders driveability. Mitsubishi has issued parts to be warranted and has denied all responsibility. Mitsubishi has quoted that the ses (check engine light) in no way, when illuminated, affects driveability, value, mechanical functions of the vehicle. Therefore, in short, they are claiming that the light is just for show. I have written proof from Mitsubishi with that statement denying all claims and not taking any responsibility.