A1 Smog

🏢 About Us

A1 Smog is a trusted, test-only smog check station proudly serving Vallejo and surrounding areas. Located conveniently between Tennessee Street and Nebraska Street on Sonoma Blvd, we specialize in fast, reliable, and STAR-certified emissions testing for all vehicle types—including diesel.

⭐ Why Choose A1 Smog?

  • STAR-Certified
    We meet the highest performance standards set by the Bureau of Automotive Repair.
  • Test-Only Station
    No repairs—just honest, unbiased smog checks.
  • Diesel Vehicle Testing
    We’re equipped to test diesel vehicles from 1998 and newer, as required by California’s Smog Check Program.
  • Affordable Pricing
    Take advantage of our $30 OFF coupon (plus certificate fee of $8.25).
    Must present coupon at time of write-up. Offers may not be combined.

📰 Smog Test News

  • Effective Jan 1, 2013: DMV now refers most drivers to STAR-certified stations for registration renewals.
  • Effective Jan 1, 2010: Diesel vehicles 1998 & newer are included in the Smog Check Program.

📍 Visit Us

Find us on Sonoma Blvd. in Vallejo, CA
📱 Check out our reviews and updates on Yelp

Whether you’re renewing your registration or buying a used car, A1 Smog is your go-to destination for quick, certified smog checks