Mitsubishi Outlander Sport catalytic converter issue noted on Mitsubishi Outlander Sport

Some Mitsubishi Outlander Sport owners report experiencing issues with the catalytic converter, commonly indicated by the P0420 trouble code, which often triggers the check engine light. Additionally, a crack in the exhaust tube upstream of the converter may lead to various oxygen sensor-related trouble codes in some models. Symptoms of a clogged catalytic converter can include limited performance at higher speeds, irregular engine running, unusual exhaust odors, poor fuel economy, and rattling noises. Owners of the 2015-2020 Mitsubishi Outlander may notice loss of power, strange smells, reduced fuel efficiency, excessive heat, and the check engine light illuminating with codes such as P0421 or P0431. Common fixes for the P0420 code generally involve replacing the catalytic converter or the O2 sensor, but it is crucial to verify the need for a new converter before proceeding. Engine issues like misfires or incorrect fuel trim can also affect catalytic converter performance, potentially triggering the P0421 code. Problems may arise from rusting, condensation inside the converter, or internal blockages.