Nissan Sentra check engine light related to catalytic converter emissions and stereo draining battery on Nissan Sentra

Some Nissan Sentra owners report experiencing issues with the check engine light being triggered by catalytic converter emissions problems, which necessitates accurate diagnosis before repairs can be made. Additionally, some owners find that a faulty gas cap can also activate the check engine light by disrupting the fuel system's pressure balance. Furthermore, there are reports of the stereo draining the battery, which is likely unrelated to the check engine light and may stem from wiring issues, a faulty stereo unit, or other electrical problems. To resolve the battery drain, it is recommended that owners have their vehicle's electrical system inspected by a qualified mechanic. If both issues occur simultaneously, addressing them separately is advised to ensure proper diagnosis and resolution.