Nissan Xterra check engine light on with lean code 171 and clicking noise in dashboard on Nissan Xterra

Some Nissan Xterra owners report experiencing issues with the check engine light, particularly when accompanied by a lean code P0171 and a clicking noise in the dashboard. This lean code indicates that the air-fuel mixture in Bank 1 is too lean, which can be triggered by problems such as vacuum leaks, faulty oxygen sensors, or dirty mass airflow sensors. Additionally, the clicking noise may be related to engine components like lifters or valves that could be affecting the knock sensor. Owners have also noted that ignition system issues, including bad ignition coils, can contribute to engine performance problems and trigger the check engine light. Low oil levels may exacerbate the clicking noise, making it crucial to check oil levels and pressure. If the check engine light is blinking, it may signal a more serious ignition system issue. Therefore, it is recommended that owners seek professional inspection to accurately diagnose and address these concerns in their Nissan Xterra to ensure optimal vehicle performance and reliability.