Mitsubishi Galant engine light on with decreased fuel economy and rough idle, resolved by replacing oxygen sensor part #15514 on Mitsubishi Galant

Some Mitsubishi Galant owners report experiencing issues such as the engine light being on, decreased fuel economy, and rough idle. These problems are often linked to dirty or damaged oxygen sensors, which are essential for regulating air levels in the exhaust system. Additionally, some owners note that problems with the engine intake, whether related to air or fuel, can result in rough or irregular engine performance. Sensor malfunctions may also significantly affect engine operation, potentially causing it to stop running altogether. Addressing these concerns, particularly by replacing the oxygen sensor with part number #15514, can lead to improved performance and efficiency for the Mitsubishi Galant.