Jetta car costs oil, and the computer looks at the data stream. When idling, the throttle opening is 5, so the throttle is changed and the opening is still 5. Why?

There are many reasons for fuel consumption, such as operating methods, whether to turn on the air conditioner in summer, running long distances, or waiting in the city. The opening is 5, and the angle is very large. First of all, after cleaning, we should do a good job in basic computer settings. If it can be set, it means that the throttle is ok and does not need to be replaced. At present, it can only be considered from the aspects of air intake and fuel injection, and computer testing is needed.