I used Hafei Lubao's new remote control to check the code, but it didn't work, nor did the old remote control, and the car wouldn't start. How to solve it?

It should be that the matching method (that is, what you said is the right code) is wrong.

Every matching is to delete the password of the original remote control first, so that even if the matching fails, your old key cannot be used.

The current solution is simple, that is, re-matching. When matching, the distance between the two remote controllers should be above 15CM, and they should not be put together. After a match, you should continue to match the second remote controller within 8 seconds (some cars are 10 seconds, set by the manufacturer) until all the remote controllers are matched.