All vehicles subject to a Smog Check inspection will require a visual test for smoke. The new test is called the
Visible Smoke Test.
WHAT IS THE TEST FOR?
Smoke from a vehicle’s tailpipe contributes to California’s air quality problems. The smoke consists of particulate matter, small
particles of pollution that are inhaled and can cause lung problems, heart disease, and other health consequences. Less effective
emissions control systems translate to unhealthy air for all of California. In addition, smoke from an engine can also damage
emission control systems on a vehicle, like the catalytic converter and oxygen (O2) sensor.
WHAT IS THE PURPOSE OF THE VISIBLE SMOKE TEST?
The Visible Smoke Test will identify vehicles in need of repair and reduce Particulate Matter (PM). PM is very small liquid and solid
particles in the air. PM is not measured by California’s existing Smog Check test. It is often associated with diesel exhaust, but it is
also produced by gasoline powered vehicles. These fine particles can collect in the respiratory system and are linked to a number of
health problems.
WILL THERE BE ANY BENEFIT TO MY VEHICLE?
Visible smoke emissions from gasoline powered vehicles are typically the result of incomplete fuel combustion or the poor
mechanical condition of the engine or transmission component in which lubricating oil is being burned. Incomplete fuel combustion
produces black or gray smoke. Burning lubricating oil from the engine or transmission produces blue or bluish-white smoke. Oil in the
exhaust causes catalyst poisoning, causing rapid deterioration of the vehicle’s catalytic converter. For vehicles equipped with
computer controls, oil will also cause rapid deterioration of the vehicle’s oxygen sensor. The oxygen sensor is an essential emission
control component that provides information to the vehicle’s computer, allowing it to control fuel mixtures and tailpipe emissions.
HOW MUCH SMOKE WILL CAUSE A VEHICLE TO FAIL ITS SMOG CHECK?
Any visible smoke emitted from the tailpipe or Positive Crankcase Ventilation (PCV) System would cause a failure of the Visible
Smoke Test. However, steam from condensation will not lead to an inspection failure.
WHAT IF THE VEHICLE FAILS THE TEST?
A vehicle that fails the Visible Smoke Test fails the Smog Check. Repairs must be made before the vehicle can receive a Smog
Check certificate. If your vehicle fails, you may be eligible for up to $500 in financial assistance.
The information provided on this page was obtained from the website - Department of Consumer Affairs/Bureau of Automotive Repair. A-Test Only is in no way
responsible for incorrect or misleading information.
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