10 reasons cars fail the California smog test

If you recently failed your California smog test, you’re probably not feeling very happy, but keep in mind that it isn’t the end of the road yet. It may not be that hard or that expensive to get it fixed. There are ten common reasons most vehicles fail smog in California:

#1 Dirty Fuel System
The fuel filters are designed to screen out the dirt and rust particles. If these substances get into the tank, it can cause damage your fuel tank and produce harmful toxins.

#2 Gas Cap
If your gas cap doesn’t fit properly or can’t hold pressure back, it can potentially release harmful fumes.

#3 EVAP System
The EVAP is designed to store gas vapors until the engine needs it. If the EVAP is faulty, the air/fuel ratio may be thrown off.

#4 Air Injection
The air injection will deliver air to the exhaust as it exits the manifold. If there isn’t enough oxygen, temperatures can rise and cause damage.

#5 Oxygen Sensor
This sensor is designed to deliver information to the “ECU” of the car. When the ECU receives this information, it will let the car know how much fuel to send to the combustion chambers. If this sensor doesn’t work, the fuel delivery can be thrown off causing increased emissions.

#6 Check Engine Light
A check engine light can be on for many reasons. If the light is on, the test will cause an automatic failure. Usually, a simple tune up can tell you what’s wrong.

#7 Fuel Injector / Carburetor
A faulty carburetor or defective fuel injectors may deliver either too much or too little fuel. Dirty fuel injectors may restrict fuel flow causing the lean fuel conditions. This can also cause severe carbon deposits on spark plugs. Carburetors may also develop similar issues.

#8 Spark Plugs
If any spark plug contain a significant amount of carbon build up, the fuel won’t ignite properly, which in turn, leads to high HC and CO levels.

#9 PCV Valve
A bad PCV valve can lead to high pressure that allows gas to get past the piston rings and mix with the engine oil. When this mix is created, it can create harmful gases and potential leaks.

#10 Catalytic Converter
This device is installed between the exhaust manifold and the muffler and is designed to reduce HC and CO emissions. If the catalytic converter is defective, it can lead to an automatic failure.

There are lots and lots or reasons your car may not be passing the required California Emissions Test SMOG CHECK. One or all of these reasons may be contributing to your vehicles inability to pass smog. Let Goodies take the hassle out of getting your car smog ready, or Fix it to comply with California emission requirements. Before you go out and buy a new Catalytic Converter make sure that is what you need to fix the problem. Let Goodies Speed Shop track down the problem and get your vehicle running at its best performance. Be sure to contact Goodies Speed Shop at (408) 295-0930. We will help you pass your California emissions test, SMOG CHECK!

* Goodies Speed Shop does not perform California smog tests


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