What are the specific steps for vehicle exhaust emission testing?

[DelBenjamin]

Information entry needs to be performed inside the login booth. The testing scheduler will log into the computer and allocate the testing lines. Vehicles ready for inspection can only proceed when they arrive at the designated testing line. Test personnel will follow the computer's instructions to perform the operations. After passing a series of tests successfully, the testing department will issue the environmental label to the vehicle owner.

[SawyerLee]

The vehicle exhaust emission test is actually quite simple. When I went to the testing station, I found the whole process was completed in about half an hour. The staff first let the car idle for a few minutes to warm up the engine, then inserted a probe into the tailpipe. At this point, the testing equipment could read the emission data, and they would monitor the display for values like hydrocarbons and carbon monoxide in the exhaust. Finally, they pulled out the probe and printed the test report, stamping it if it passed. Remember not to wash the car before the test, as insufficient water temperature can affect the results. Regular maintenance like cleaning the oxygen sensor and changing the air filter periodically can help keep the exhaust cleaner.