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General Smog Check
 

Do PCV Hoses Have To Be CARB Certified?

Hello. I am looking into replacing some of the hoses in my car as they have become brittle with age, this includes the PCV hoses. I am not tampering anything in the PCV system, just replacing the hoses with silicone hoses designated for the PCV system. Would this cause me to fail the smog check? Thank you!


Answer:  

A silicone hose cannot be used to replace a PCV hose. Silicone hoses cannot be used for oil and fuel applications. Considering the PCV system routes engine blow-by gases into the intake manifold, replacing an original PCV hose with a silicone version will cause a vehicle to fail its smog check; as a Tampered Emissions System. Fuel grade rubber hose is what is needed for this application.


posted by SmogTips Support 09-23-2021 03:39 PM
 



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