Question 1

How soon after buying a car do I need to smog it?

Accepted Answer

New owner needs valid cert within 10 days of registration.

If seller passed within 90 days that cert is valid
DMV will not register without it
Out-of-state vehicles get 20 days

Per California DMV registration rules.

Question 2

How often do I need a smog check in California?

Accepted Answer

A smog check is required every two years for most vehicles. A smog check is also required at sale or transfer. New cars are exempt for the first 8 years. Out-of-state imports need one. Per California DMV registration rules.

Question 3

When do I need a smog check for registration renewal?

Accepted Answer

Your DMV notice will specify. Typically every other renewal. Newer cars get abatement fee instead. STAR-directed vehicles need STAR station. Per California DMV registration rules.

Question 4

Do I need a smog check when selling my car?

Accepted Answer

Yes — the seller is responsible if the vehicle is over 4 years old. Must be within 90 days of sale. Buyer pays smog transfer fee. Exempt if same family. Per California DMV registration rules.

Question 5

How long is a California smog certificate valid?

Accepted Answer

It is valid for 90 days from inspection. Transmits to DMV electronically. Valid for registration use. Starts countdown at pass. Per California DMV registration rules.

Question 6

I just moved to California — do I need a smog check?

Accepted Answer

Yes — you need a smog check within 20 days of establishing California residency. Out-of-state certs not accepted. Vehicle must be 1976 or newer gas. Diesel 1998 or newer. Per California DMV registration rules.

How soon after buying a car do I need to smog it?

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