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How often do you clean the injectors and valves of Audi A4 1.8T (km)?

Let me tell you this question. If the vehicle is driving in urban areas for a long time, it is recommended that you clean the throttle body every 15000 km, and clean the fuel injector and air intake every 30000 km or once a year. If the vehicle can often travel at high speed or the road conditions are good, the cleaning cycle can be appropriately extended. Cleaning up carbon deposits mainly depends on road conditions and driving habits.