Excessive emission mainly refers to that carbon monoxide, nitrogen oxides, nitrogen and hydrogen exceed the national emission standards. Most excessive exhaust gases are related to carbon deposition in the fuel supply system, and the failure of three-way catalyst is more common in old models and luxury cars that are too picky about oil. During the annual inspection, it is very common for NOx to exceed the standard. Sometimes, during the online inspection, the accelerator pedal control of the operator is not stable enough, and the speed is fast or slow, which may also exceed the sta standard. If you check again, the inspection may be over, which is common in the old models. You should not only replace the three-way catalytic converter, but also do a series of debugging. It is understood that at present, the main way to eliminate the excessive exhaust gas is to clean and maintain the fuel supply system, including (gasoline section) nozzle, gasoline pipe, (air section) intake pipe, throttle, valve seat, combustion chamber and three-way catalytic converter, check the spark plug, and replace the air filter and gasoline filter, so as to eliminate carbon deposition, Reduce emissions. If the exhaust gas exceeds the standard due to the failure of three-way catalytic converter, it is within the scope of vehicle warranty and can be replaced free of charge within 60000km within two years.
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