How do you read a smog test?
How to Read Smog Test Results
- Review the testing procedure. Using California as an example, vehicles are run through each test at two different speeds.
- Read the first line of the emissions test results.
- Read the results in each emissions category.
- Read and follow any of the maintenance notes included in the report.
What does a smog check check for?
HOW DOES A SMOG CHECK WORK? Your vehicle’s emissions are inspected visually and with special testing equipment that detects levels of carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxide, and emissions from evaporation.
What happens when your car fails a smog test?
When your car gets a smog test, one portion of the test involves connecting the smog test machine to the car’s computer and checking if there are any DTC’s, and also checking to see if the monitors are ready. If they are not, the vehicle fails the test, because there may be problems in the system that can’t be reported by the computer.
When does Smog Check Come Out the tailpipe?
It does not test what is going on when the engine is cold, idling, decelerating, etc. Also, not all the smog a car makes comes out the tailpipe.
Can a car pass with only one smog monitor?
Note that a car can pass with some incomplete monitors…a maximum of one on 1999 and earlier cars, and only one ( The Evaporative System monitor) on model year 2000 and later gasoline powered automobiles. All monitors must be complete on 1998-2006 diesel powered vehicles.
What are the three parts of a smog check?
The overall smog inspection consists of three parts…the emissions test, which measures the smog coming out of the tailpipe; the visual inspection, to look for broken or modified parts; and the functional tests, where other systems are checked to see if they are working properly.