Join the community and post your question. Use our Ask-A-Tech for free now! ASE experts standing by.

Forum > General Smog Check > Question

Is Sealant on Emission Hose or Vacuum Line Permitted?

My car just passed the functional smog test but failed the visual part because I had sealant on a vacuum hose. I put sealant on egr system valve hose when I got a trouble code for a small leak. P0442 was the code - EVAP Emissions Small Leak. I still got the trouble code after the sealant and so replaced emissions canister and that fixed the problem. Can I not have sealant on a hose?
Answer:

Sealant is not allowed on vacuum hoses or vacuum lines. The California smog inspection process requires that vacuum lines and hoses be replaced when needed. Using sealant to repair a vacuum line, when the vacuum line pertains to the vehicle's emissions system, will cause the smog technician to mark the particular emissions system to which the vacuum line or hose belongs as tampered and/or defective. Why am I not allowed to repair a vacuum line? Often repairs of vacuum lines and hoses are not made to withstand the California Air Resources Board's stringent heat and durability requirements. Once a vacuum hose has development a problem needing repair, the CARB suspects the vacuum line has reached its service life capacity and requires the component replacement. It is not uncommon to see more failing vacuum hoses when one is detected, especially in high heat engine compartment locations. What's the remedy to repair a vacuum hose and pass the smog test? If you're considering repairing as in replacing... then you'll be fine. Vacuum lines and hoses are commonly replaceable with aftermarket inexpensive counterparts. For the price of sealant you may be able to purchase several feet of vacuum line. Ensure to purchase the correct diameter for your replacement. It is pertinent that vacuum lines and hoses seal air/vacuum tightly at all connection points. posted by SmogTips Support

Related Vacuum Line questions and answers you might find useful:

How To Get BMW 325i Emission Monitors Ready by Andrew

Passing Smog 1987 Toyota MR2 4AGE Converted to 1988 4AGZE by Kobi

Is Sealant on Emission Hose or Vacuum Line Permitted? by Jon

1996 Nissan 200sx SE-R Won't Pass on HC @ 15 MPH by Anthony

1989 Honda Civic Wagon with d15b2 Failed Visuals? by Omar

View SmogTips.com in: Desktop / Mobile

Is Sealant on Emission Hose or Vacuum Line Permitted?

Sealant is not allowed on vacuum hoses or vacuum lines.

Why am I not allowed to repair a vacuum line?

What's the remedy to repair a vacuum hose and pass the smog test?