Nissan Xterra check engine light always on with fuel code and tire pressure warning on Nissan Xterra

Some Nissan Xterra owners report experiencing a constantly illuminated check engine light, which may be linked to various issues such as a faulty fuel level sensor or a loose gas cap affecting the fuel system's pressure balance. Additionally, when the tire pressure monitoring system (TPMS) warning light is activated, owners are advised to check the tire pressure on all wheels, as driving on under-inflated tires can lead to overheating and potential tire failure. Common causes of the check engine light include ignition cylinder problems that result in irregular engine performance and faulty exhaust gas oxygen sensors that can cause misfires. If the TPMS light is illuminated but not triggering the check engine light, it is recommended that owners have the diagnostic codes read to pinpoint the issue. The check engine light, also known as the Malfunction Indicator Light, can indicate problems within the emission control system, necessitating prompt attention. It is advisable for owners to consult a qualified mechanic or service center to accurately diagnose and resolve these issues.