When will Peugeot 408 throttle and injector be cleaned?

The main purpose of cleaning the throttle is to clean the airway and prevent the car from idling badly. The purpose of cleaning the nozzle is to improve the atomization ability of the nozzle and enhance the power and economy of the engine. Generally, the throttle valve is cleaned every 15000km to 20000km, and the fuel injector is cleaned every 30000km to 40000km. Of course, it has a lot to do with your driving environment, oil quality and driving habits.