When your California renewal notice says a smog check is due, get the test, let the station send the result to the DMV and then finish your renewal. The certificate is valid for 90 days, so test within that window before the registration expires.
Key takeaways
- Read the notice for station type requirements.
- Test within 90 days of your registration deadline.
- The station sends results electronically.
Read the notice first
The renewal notice tells you whether a smog check is due and whether you need a STAR or Test-Only station. If a smog check is not required, you can renew without one. If it is, you cannot finish the renewal until the result is in the DMV's system.
Timing the test
A smog certificate is valid for 90 days. Testing a month or two before your deadline gives you time to repair a failure. Waiting until the last week leaves no time for repairs and a retest, and late fees add up.
At the station
Bring the vehicle and notice. The technician enters the vehicle information, performs the test and reports the result. You do not carry paper to the DMV, because the result transmits electronically. You can then renew online, by mail or in person.
If you fail close to the deadline
Get a diagnosis immediately. Our repair page explains how we handle failures and retests. If cost is a concern, ask about the state's Consumer Assistance Program. The DMV can also advise on options if a repair truly cannot be finished in time.
Moved or bought a car recently
A newly purchased used car often needs a smog certificate at transfer from the seller. A car registered in another state needs a California smog check before registration. Check your paperwork.
What the renewal notice actually tells you
The notice lists your registration expiration date, the fees due and whether a smog check is required. It may also state which kind of station you must use. Many drivers pay the renewal first and then discover the smog requirement, which delays the sticker. Read the smog section before you pay anything, because the station result has to be in the DMV system before the renewal completes.
Common timing mistakes
Testing too early wastes the 90-day window, because the certificate can expire before you renew. Testing in the last week leaves no room for a retest. The best window is roughly thirty to sixty days before expiration. If you plan to travel, test before you leave. If your car is borderline, test earlier so you have time to repair it and avoid late fees on the registration.
Need help in south Bakersfield?
Questions about smog check? Read our Smog Check page, call (661) 599-9098 or request a time. Peña's Auto Electric, Smog & Repair, 303 Taft Hwy, Suite B, Bakersfield, CA 93307. Mon to Fri 9:30 AM to 5:30 PM, Sat 8 AM to 1 PM.
Frequently asked questions
How long is a smog certificate valid?
90 days for registration.
Can I renew online after smog?
Yes, once the station's result reaches the DMV.
What if I miss the deadline?
Late fees may apply. Get the test as soon as possible.
Do I need the paper certificate?
No. Results go to the DMV electronically.
Related reading
Sources
- California DMV, Smog certification and registration renewal