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How to replace valve cover seals if they are not replaceable. Nissan valve covers are not repairable if the spark plug well seals fail, to replace them you need to change the entire cover Nissan 13264-8J113 Valve cover assembly (front) Nissan13264-8J102 Valve cover assembly (rear) Nissan13276-53Y0A Spark plug well sealing ring Toyota11193-76020 Spark plug well ring command for the engine ECU, to reset fuel trims 10C0;3106FFFF;3206;3306