Shaanxi Automobile Xuande has four cars before and four cars after, and the after-treatment system has been reporting faults, limiting electricity and checking urea.

1. Check urea. Without urea, cars will have a speed limit. After adding urea, restart the main switch and wait for a few seconds.

2. If it is invalid, find the regeneration button on the central control. After pressing the regeneration button, the trip computer will prompt that the regeneration has started, and then the vehicle will automatically clean the DPF. During the cleaning process, the vehicle will increase its speed and idle for about 5 to 10 minutes. At this time, do not control the vehicle or turn off the engine until the driving computer prompts that the regeneration is completed.

If it still doesn't work, go to school to check whether the oil pump is damaged.