Vehicle overloading diesel vehicles emissions errors is also an important reason. China's trading serious overloading of vehicles, can be said to be a "chronic problem." Today, because of the transportation industry competitive, some vehicle owners to clearly only with 3-5 tons of vehicles, and simply loading more than 10 tons. This serious overloading not only pose a safety hazard, but also in the non-diesel engine under normal operation conditions, vehicle emissions errors caused serious pollution of the environment.

Vehicle maintenance irregularities, including the timely replacement of filter, and not in accordance with the provisions of re-calibration fuel injection system, the use of substandard lubricants.