21ST Avenue Smog Test Only

21st Avenue Smog Test Only is a dedicated emissions testing station at 71 21st Ave Suite B, San Mateo, CA 94403. It performs smog checks for passenger cars, mainly using OBD‑II diagnostics with tailpipe testing for older vehicles. The shop opens Monday through Saturday from about 8:30 am to 5:45 pm, Sundays closed. Customers report fast, in‑and‑out service and affordable pricing especially with coupons, though certificate fees or STAR charges can raise the total. Accepts cash, credit cards and debit cards. A quick, no‑nonsense smog check in San Mateo.

Smog inspection station

Test Only

San Mateo, CA

Contact

Address 71 21st Ave Suite B, San Mateo, CA 94403, United States

Phone +1 650-350-1922

Hours

Monday 8:30 am–5:45 pm

Tuesday 8:30 am–5:45 pm

Wednesday 8:30 am–5:45 pm

Thursday 8:30 am–5:45 pm

Friday 8:30 am–5:45 pm

Saturday 8:30 am–5:45 pm

Sunday Closed

Services

Station Type Test Only

Test Types

OBD-II Tailpipe

Vehicles Served

Passenger Cars

Languages English

Practical Information

Appointments Walk-ins Welcome

Typical Wait Under 15 minutes

Pricing $30 - $78

Payment

Cash Credit Card Debit Card

Rating

3.8 / 5

Based on 54 reviews

3.8 / 5

Smog Check rating (25 reviews)

Location

San Mateo, California

More stations in San Mateo

What Customers Say

Fast Service Fair Pricing Friendly Staff Easy Process Good Communication

Speed: Fast

Pass Rate

Standard

Based on customer review sentiment

Making the Most of Your Visit to 21ST Avenue Smog Test Only

Choosing the right smog check station in San Mateo, California can save you time, reduce stress, and help ensure your vehicle passes its inspection on the first try. 21ST Avenue Smog Test Only is one of the licensed smog check locations in the area, and preparing properly before your visit can make the process smoother.

Understanding California Smog Check Requirements

Smog Check rules in California vary by vehicle type, registration ZIP code, and model year. Since requirements can differ even within San Mateo, confirm what applies to you before heading to 21ST Avenue Smog Test Only. Our California Smog Check guide outlines current rules, exemptions, and testing intervals.

Before Your Smog Check

To help make your smog check quick and successful, consider preparing the following:

Confirm your registration address requires testing.
Ensure your check engine light is off and no recent codes have been cleared.
Warm up your vehicle by driving 10 to 15 minutes before testing.
Bring your registration or renewal notice and a valid photo ID.

Why Reviews Matter

Customer experiences can vary, so reading feedback from other drivers can help you understand what to expect. 21ST Avenue Smog Test Only currently has 54 reviews with a 3.8 out of 5 rating, which can provide insights into service quality, wait times, and professionalism.

Visit Checklist

1

Verify Certification

Ensure 21ST Avenue Smog Test Only is an active, licensed smog check station in California.
2

Check Reviews

Read recent customer feedback from other San Mateo drivers to understand typical wait times and service quality.
3

Confirm Services

Call ahead to confirm the types of tests offered and whether appointments are required.
4

Bring Required Documents

Have your registration or renewal notice, ID, and any required paperwork ready when visiting the station.
5

Ask About Retest Policies

Some stations offer discounted or free retests if your vehicle fails. Ask for details up front.

* This guide is for informational purposes only. Always confirm smog check requirements and policies with your local California authorities.

FAQ

Common questions

Have a question not covered here? Contact us and we will respond within one business day.

Where is 21ST Avenue Smog Test Only located?

21ST Avenue Smog Test Only is located at 71 21st Ave Suite B, San Mateo, CA 94403, United States in San Mateo, California.

What services does 21ST Avenue Smog Test Only offer?

21ST Avenue Smog Test Only is categorized as a Smog inspection station and operates as a Test Only station offering OBD-II, Tailpipe testing for passenger cars.

Does 21ST Avenue Smog Test Only provide Smog Check?

Yes, 21ST Avenue Smog Test Only provides Smog Check in San Mateo, CA. Available test types include OBD-II, Tailpipe.

What are the hours for 21ST Avenue Smog Test Only?

21ST Avenue Smog Test Only is open: Monday 8:30 am–5:45 pm, Tuesday 8:30 am–5:45 pm, Wednesday 8:30 am–5:45 pm, Thursday 8:30 am–5:45 pm, Friday 8:30 am–5:45 pm, Saturday 8:30 am–5:45 pm, Sunday Closed.

How can I contact 21ST Avenue Smog Test Only?

You can reach 21ST Avenue Smog Test Only by phone at +1 650-350-1922, or by visiting 71 21st Ave Suite B, San Mateo, CA 94403, United States.

Do I need an appointment at 21ST Avenue Smog Test Only?

21ST Avenue Smog Test Only accepts walk-ins with no appointment necessary. Contact them directly to confirm availability.

How long does Smog Check take at 21ST Avenue Smog Test Only?

Typical wait time at 21ST Avenue Smog Test Only is Under 15 minutes. Customers generally describe the service speed as Fast.

How much does Smog Check cost at 21ST Avenue Smog Test Only?

Pricing for Smog Check at 21ST Avenue Smog Test Only is typically $30 - $78. Contact them directly for exact pricing.

What payment methods does 21ST Avenue Smog Test Only accept?