What does the Audi fault code p218800 mean?

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Audi fault code p218800 indicates that the system is too rich at idle; below is relevant information about fault code p218800: 1. Solution: It is necessary to go to a 4S dealership for specialized instrument detection and repair to clear the fault code; 2. Causes: Leakage in the intake pipe from the turbocharger to the throttle, including faults in the air flow sensor, turbo pressure sensor, mechanical failure of the turbocharger, or wiring faults in the air flow meter or turbo pressure sensor; 3. Manifestations: Poor working performance of related sensors, such as the oxygen sensor, coolant temperature sensor, intake air temperature sensor, throttle position sensor, air flow meter, or intake manifold pressure sensor.