What should I do if the annual inspection of automobile exhaust is not up to standard?

Here are some ways to make the annual inspection of automobile exhaust up to standard: 1. Cleaning the throttle of the car: Under normal circumstances, the cleaning cycle of the throttle is 20,000 kilometers. According to different brands and models, the charges of 4S shops vary greatly. 2. Clean up the carbon deposit inside the engine: Cleaning up the carbon deposit inside the engine can dissolve the sludge, colloid, moisture, metal chips and other deposits inside the engine, reduce the pollution of new engine oil and prolong the service life of the engine. Its cleaning cycle is generally 30,000 kilometers, and the cleaning method of carbon deposit inside the engine is also very simple. 3. Cleaning the carbon deposit on the fuel pipe: Cleaning the carbon deposit on the fuel pipe includes cleaning the fuel nozzle, combustion chamber, spark plug, throttle and other parts. Cleaning these does not need any disassembly, just add special cleaning fuel additives to the automobile fuel tank regularly, and good cleaning effect can be achieved. 4. Cleaning the carbon deposit in the air intake system: Although some carbon deposit will be discharged through the engine, some carbon deposit will always be intercepted by the three-way catalyst, which is easy to block the three-way system, so the cleaning times should not be too much.