What is the reason for Volkswagen Touran fault code 16497?

The throttle is broken. This fault code reports a mechanical fault of the throttle control module and a mismatch between engine control units. Coupled with your fault, it should be that the throttle is broken. You can try cleaning it first. If it doesn't work, you have to change the throttle. Cleaning the throttle can make the air intake smooth, restore the idle speed and emission of the vehicle and restore the power of the vehicle. The function of the throttle valve is to control air to enter the engine. After the air enters the intake pipe, it is mixed with gasoline to form a combustible mixture, and the combustion is successful.