Where to get a smog check in Redwood City

Redwood City has two state-certified smog check stations run by the Bureau of Automotive Repair (BAR). You can find them listed on the official BAR website by searching your zip code (94061 or 94062 for most of Redwood City). Both stations perform the same test and charge the same fee — currently $29.75 for most vehicles, though prices can vary slightly.

You do not need an appointment at either station. Walk-ins are accepted during business hours, though you may wait 30 minutes to an hour during peak times. Both stations are open six days a week, typically closing on Sundays or Mondays. Call ahead if you want to confirm current hours or ask about wait times.

If you cannot reach a Redwood City station, any BAR-certified station in California will perform your test. The certificate is valid statewide and satisfies the requirement no matter where you took it.

Key Takeaways

  • Redwood City has two state-certified smog check stations that charge $29.75 and accept walk-ins without appointments.
  • You can find both stations on the Bureau of Automotive Repair website by searching your Redwood City zip code.
  • Your vehicle must pass the smog check before you can renew your registration with the California Department of Motor Vehicles.
  • If your vehicle fails, you have 30 days to repair it and retest at no additional charge at the same station.
  • Bring your vehicle registration and a valid ID to the station; the test takes 10 to 15 minutes.

What to bring and how long the test takes

Bring your vehicle registration and a valid photo ID. The technician will need your license plate number and vehicle identification number (VIN) to look up your vehicle's test history. You do not need to bring your smog check appointment letter or any other paperwork — the station has access to your DMV records.

The test itself takes 10 to 15 minutes. The technician will connect your vehicle to a machine that measures emissions from your tailpipe. For most vehicles, this is a straightforward plug-in process. Hybrid and electric vehicles have different requirements and may not need a smog check at all, depending on the model year.

You will receive your results when ready. If you pass, the station sends the certificate directly to the DMV electronically. You do not need to print or mail anything. If you fail, the station gives you a written report showing which emissions standards your vehicle did not meet.

What happens if your vehicle fails

A failed smog check does not prevent you from driving. It only prevents you from renewing your registration until you repair the vehicle and pass a retest. You have 30 days from the test date to fix the problem and return to any BAR-certified station for a free retest.

The written failure report will tell you which emissions system is likely causing the problem — usually the catalytic converter, oxygen sensor, or fuel system. Take this report to a mechanic. You do not have to use the smog station's mechanic; you can take your vehicle anywhere. Many independent shops in Redwood City specialize in emissions repairs and can often diagnose the exact problem for $50 to $100.

After you repair the vehicle, return to any smog check station (not necessarily the same one) and request a retest. Bring the original failure report. If you pass the retest, the new certificate goes to the DMV when ready, and you can renew your registration online or at the DMV office.

Timing for registration renewal

Your smog check must be current before you renew your registration. In California, most vehicles need a smog check every two years. The DMV will not let you renew online if your smog check has expired, and you cannot register the vehicle until you pass a new test.

The smog check certificate is valid for 30 days from the test date. If you pass the test but do not renew your registration within 30 days, you will need a new smog check. Plan to get your test done within two weeks of your registration expiration date so you have time to handle any repairs if needed.

You can check your registration expiration date on your vehicle registration card or by logging into your DMV account online. The DMV typically sends a renewal notice 60 days before expiration, which is a good time to schedule your smog check.

Vehicles exempt from smog checks

Not all vehicles need a smog check in California. Electric vehicles (EVs) and plug-in hybrids (PHEVs) registered after January 1, 2020 are permanently exempt. Vehicles that are four model years old or newer may be exempt in their first registration renewal, though this depends on the specific year and model.

Diesel vehicles have different testing requirements than gasoline vehicles. If you own a diesel truck or SUV, ask the smog station whether your vehicle qualifies for a diesel smog check or is exempt based on model year. Motorcycles and trailers are also exempt.

If you are unsure whether your vehicle needs a smog check, check your DMV renewal notice — it will state whether a smog check is required. You can also call the Redwood City smog stations and give them your vehicle's year, make, and model.

Redwood City smog check costs and payment

The state-set fee for a smog check in Redwood City is $29.75 for most gasoline vehicles. Diesel vehicles may cost slightly more. Both certified stations in Redwood City charge this same amount — the price is not negotiable because it is set by the state.

Both stations accept cash and card payments. If your vehicle fails and you need a retest, the retest is free within 30 days of the original test date. You only pay the $29.75 fee once per test cycle, even if you fail and retest multiple times.

Frequently Asked Questions

Can I get a smog check if my check engine light is on?

No. The smog station will not test a vehicle with an active check engine light. You must have a mechanic diagnose and repair the problem first, then clear the code. Once the light is off and the vehicle has been driven for at least 100 miles, you can return for a smog check.

How long does it take to get the results after I pass?

The station sends your passing certificate to the DMV electronically the same day. You can renew your registration online or at the DMV office when ready. You do not need to wait for a physical certificate in the mail.

What if I move out of Redwood City before my registration expires?

Your smog check certificate is valid in any California county. If you move within California, you can renew your registration in your new county using the same certificate. If you move out of state, you will not need a smog check for that vehicle in most states.

Do I need to make an appointment at the Redwood City smog stations?

No. Both stations accept walk-ins during business hours. You may wait 30 minutes to an hour depending on how busy they are. Calling ahead to ask about current wait times can help you plan your visit.

What if the smog station says my vehicle cannot be tested?

This is rare but can happen if the vehicle is too old, has been heavily modified, or has a mechanical problem that makes testing unsafe. Ask the technician for a written explanation. You may be able to take the vehicle to a different certified station for a second opinion, or contact the Bureau of Automotive Repair for guidance.