Matching You with a Pre-Screened Smog Check Center You will Love
Free Online Smog Check Diagnosis
$500 Free Consumer Repair Assistance
Failed Emissions Test
How to Pass the Test
Who Else Wants To Pass the Smog Check
Which Type Should I Choose?
    Forum > Emissions Component > Question

Join the community and post your questions. Ask-A-Tech right now!

Emissions Component

Is a PCV Catch Can Legal for Use in California?

Is the use of an aftermarket "catch can" legal for use in California? A catch can is a baffled container that is installed in the PCV line(s) to remove oil from the crankcase blow-by gases before they return to the engine, preventing oil-fouling of the intake system when the gases are reintroduced to the engine for burning. It is a passive device with no moving parts.


Unfortunately not. Any modification to a vehicle's emissions system is considered an Emissions Tamper and will cause a vehicle to fail the California smog check... regardless of whether the modification will improve or degrade harmful emissions output. If an emissions component is not tested and approved by the California Air Resources Board for use an any given make, model, and year vehicle and engine, the component may not be legally installed on the vehicle's engine.

posted by SmogTips Support

Related PCV Catch Can questions and answers you might find useful:

Is a PCV Catch Can Legal for Use in California? by Chuck