A mileage TOYOTA owner said: the engine fault light of the car is on the way. This is the second time that we have checked the shop. The owner is very unhappy. The technician confirms the fault and then checks the fault code: the system is too dilute. Click the freeze data when the fault occurs. The data show that the action is done for the action. The long-term fuel correction value is too large, which proves that the air-fuel ratio is too dilute for a long time.