How to solve the fault of Volkswagen P30C000 fuel quality defect?

Volkswagen P30C000 fault code, that is, the fuel quality is defective. As the name implies, substandard oil is not a common problem. However, the probability of occurrence is quite high, especially for LaVida, Sagitar, Jetta, Santana, Ming Rui and Bora, which are equipped with EA2 1 1 engines. P30C000 What are the causes of fuel quality defects? This question is really hard to say. You said the quality of oil was poor. Some car owners have changed several gas stations, and the problem still exists. In order to solve the problem of substandard fuel quality of P30C000, the manufacturer has issued a technical bulletin to every store in 4S. The solution is as follows: 1. Clean the oil circuit; 2. Change the fuel. If you used to add all kinds of No.92 gasoline, try adding No.95 gasoline; 3. Remove engine carbon deposit, including spark plug carbon deposit, valve carbon deposit, throttle carbon deposit, manifold carbon deposit, combustion chamber carbon deposit, etc. 4. If the above methods can't be solved, you can only upgrade the computer version of the software. To sum up, the fuel quality of P30C000 engine of Volkswagen EA2 1 1 is defective. If there is no problem with the engine mixed data stream, the only solution is to update the firmware of the computer version. Now the manufacturer has done the elimination method. I wonder if the insured vehicle is free. Friends can go and see.