At A PLUS SMOG, we provide fast, reliable, and affordable smog check services to help you stay compliant with California emissions regulations. Whether you're registering your vehicle, selling it, or just due for a biennial test, we’ve got you covered.

Our Smog Check Services
Smog Check – Test Only
We perform Test-Only smog checks — no repairs, just an honest and accurate emissions test. Ideal for vehicles flagged as “Test Only” by the DMV.
Diesel Vehicle Smog Checks
We test diesel vehicles under 14,000 lbs that are model year 1998 or newer. Stay compliant with diesel emissions standards.
DMV Smog Certification
Get your official smog certificate electronically sent to the DMV once your vehicle passes the test. No extra steps needed.
Gross Polluter Retests
Has your vehicle failed a previous smog test? We offer retesting after repairs to help you meet state requirements.
Out-of-State Vehicle Smog Check
Bringing a vehicle into California? We provide smog checks required for out-of-state vehicle registration.

What Vehicles Do We Test?
- Cars & SUVs
- Trucks & Vans
- Hybrids
- Diesel (under 14,000 lbs)
- RVs (pls call to confirm size of the vehicle)

📍 Why Choose Us?
Fast, No Appointment Needed
Fair Pricing & Honest Testing
Free Wi-Fi & Comfortable Waiting Area
Instant DMV Reporting
Convenient Location in Redwood city.