Kia Spectra Check Engine Light Code P01074 with lean fuel mixture issue and suspected oxygen sensor failure on Kia Spectra

Some Kia Spectra owners report experiencing issues related to the Check Engine Light displaying code P01074, indicating a lean fuel mixture on bank 1 of the engine. This lean condition, characterized by too much air and not enough fuel, can lead to poor engine performance, including symptoms like rough idling, jerky acceleration, and decreased fuel economy. Additionally, some owners suspect oxygen sensor failure as a contributing factor, as a malfunctioning O2 sensor can exacerbate the lean fuel mixture issue and trigger the P01074 code. To address these concerns, it is recommended that owners check the oxygen sensor, inspect for air leaks in the intake system, and ensure the fuel delivery system is functioning properly. While resetting the Check Engine Light is possible, it is crucial to resolve the underlying issue first to prevent further performance problems.