Nissan Versa small engine light issue possibly due to a leak on Nissan Versa

Some Nissan Versa owners report experiencing issues when the check engine light illuminates, often linked to potential leaks in the vehicle's fuel system. Common causes include a loose or faulty gas cap, which can disrupt pressure balance and trigger the onboard diagnostic system. Additionally, error codes such as P0456 may indicate problems with the EVAP system, often associated with the gas cap or vent solenoid. Owners have also noted challenges in detecting very small leaks in the EVAP system, even with specialized equipment, underscoring the importance of consulting a professional for accurate diagnosis. Specific issues reported include problems with the vent valve, o-ring, and breaks in the vent hose, which have been documented in service bulletins or recalls. Error codes like P0442 and P0456 highlight the need for attention to small leaks to prevent fuel vapors from escaping into the environment. It is advisable for those experiencing the check engine light issue to seek inspection from a qualified professional to address any underlying problems.