How to distinguish Changhe Freda k2 1, five countries and six countries?

Check the related contents on the certificate. There will be a lot of key information on the vehicle certificate, including the single item of emission standards, which will clearly indicate the national emission standards implemented by the vehicle. For an intuitive example, the national V is GB 18352.5-20 13, so it is a very effective method to determine whether the vehicle you want to buy is national V or national VI.