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Air Filter Smog Check Questions & Answers



Question: I have a 2000 Toyota Tundra with a properly installed cold air intake.  The first Smog station I went to looked at it and said they can't even inspect it.  Were they just being over cautious?  Will every smog station reject it just because it is not the stock air filter?  No emissions components have been removed.
 
Answer: Most air intake units are not smog legal, but there are some out there which are. Air intake units which are smog legal should have an EO number (Executive Order) indicating the State has approved their use on California vehicles. State approved intake units will have all the necessary emissions your vehicle's manufacture requires. Non approved units may not. And yes, the visual inspection of the air intake system, is a part of the smog inspection. If your vehicle is equipped with an Air Intake Unit which has not been approved by the State of California as smog legal, your vehicle will fail the smog test.
 
Legal Aftermarket Emissions component/s you install must have a EO#  Number. If you can show proof that the  units are sold legally in California and possess an EO number, (EO stands for Executive  Order- this is the number given to the product by the government certifying that it is  emissions legal) then you shouldn't have a problem. Most manufactures of aftermarket exhaust  or emission components will stamp this number on the actual unit or they will print in the  units manual, catalog or some other paperwork which pertains directly to the component in  question. You will have to present this number to the smog station where the car is being  tested.
 
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Question: If i have an aftermarket k&n air intake will my 2003 toyota tundra pass a california smog check?
 
Answer: The Aftermarket Filter itself will not cause an emissions failure, however if the component you are talking about includes not only the filter but the housing assembly also, you may have a problem. Aftermarket Air Intake housing assemblies may sometimes not have the necessary PCV and/or proper vacuum lines, and may be designed different from the manufacturers original component
(different in shape and design), therefore making them illegal for in use in California.
 
Your best bet is to contact the manufacturer's of this product if you plan on using it in
California, or insure its got an EO number. To answer you question, unless the aftermarket part is the filter itself (which fits the manufacturers original housing assembly without modificiation) it will fail the smog test.