What's wrong with Qiaoge i 125' s trachea exhaust?

Does the subject want to ask "What happened to Qiaoge i 125 exhaust pipe?"

1. The air intake system is not smooth, and the fuel pump and fuel pressure regulating valve are damaged. Replace the fuel pump and fuel pressure regulating valve.

2. There is too much carbon deposit in the engine, and the carbon deposit inside the engine should be cleaned regularly.

3. If the three-way catalyst or oxygen sensor fails, please replace it with a new one. The above are the causes and solutions of excessive exhaust gas from Qiaoge i 125 exhaust pipe.