States
California
Union City

Emissions Testing in Union City, California

Find 5 licensed smog check stations in Union City. Browse test-only centers, STAR-certified locations, and shops offering registration renewal inspections. Requirements in California vary by vehicle type and model year.

5 stations
Union City, CA
View California requirements
UC

Union City Smog Check

4.7 · 155 reviews
Smog inspection station · 33365 Mission Blvd, Union City, CA 94587

Union City Smog Check provides emissions testing and smog check services in Union City, California. View hours and detai...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
GS

Gill Smog Check Test Only

4.6 · 24 reviews
Smog inspection station · 33090 Mission Blvd, Union City, CA 94587

Gill Smog Check Test Only offers emissions testing and smog check services in Union City, California. View hours and det...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
AN

Alvarado Niles Smog **STAR** & HD I/M Test Station

4.3 · 11 reviews
Smog inspection station · 31300 Alvarado-Niles Rd, Union City, CA 94587

Alvarado Niles Smog STAR & HD I/M Test Station provides reliable emissions testing and smog check services in Union City...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
QS

Quik Smog Union City *STAR* Station

3.9 · 100 reviews
Smog inspection station · 2601 Decoto Rd, Union City, CA 94587

Quik Smog Union City *STAR* Station offers emissions testing and smog check services in Union City, California. View hou...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
BS

Bay Star Auto Care

3.8 · 78 reviews
Auto repair shop · 1275 Atlantic St, Union City, CA 94587

Bay Star Auto Care offers reliable smog check and emissions testing services in Union City, California. View hours and d...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis

City Guide

Emissions Testing in Union City, California

Finding a reliable place for emissions testing or a smog check in Union City is easier than ever. Our directory lists 5 licensed and verified emissions testing stations in the city, including STAR-certified and test-only centers where required. Whether you're renewing your registration or completing an out-of-state transfer, this page helps you quickly locate nearby inspection facilities and understand what applies in California.

Do Vehicles in Union City Need an Emissions Test?

Most drivers in Union City follow the same rules set by California. Requirements vary based on vehicle age, fuel type, and county. If you're unsure whether your ZIP code or vehicle model year requires a test, use this directory to browse local stations or review our state-specific testing requirements.

Types of Smog Check Services Available

  • Standard emissions tests for gasoline vehicles
  • OBD-II inspections for 1996+ model years
  • Tailpipe testing for older vehicles where required
  • Diesel emissions testing
  • Hybrid and electric vehicle smog checks
  • Registration renewal support
  • Test-only or STAR-certified inspections (state dependent)

Each listing includes the station's address, contact information, operating hours, and service notes to help you choose the right location.

Smog Check Tips for Union City Drivers

Before heading to a testing center in Union City, make sure:

  • Your check engine light is off
  • Your vehicle has completed recent drive cycles
  • The gas cap is properly sealed
  • The engine is fully warmed up
  • You have your registration and ID

Following these steps greatly increases the chance of passing on the first attempt.

Why Use This Directory?

Drivers in Union City rely on this directory because it provides a complete list of verified emissions testing stations, map-based navigation for quick lookup, accurate state-updated requirements, support for gasoline, diesel, hybrid, and electric vehicles, and clear explanations of exemptions and frequency rules.

View California Requirements

Frequently Asked Questions About Emissions Testing in Union City, California

Get answers to common questions about smog checks, testing requirements, and finding the right station in Union City.

You can use this directory to find licensed emissions testing and smog check stations in Union City. Browse the listings above to see addresses, contact details, and services offered, then choose the station that's most convenient for your part of the city.
It depends on California's emissions testing program, your registration ZIP code, and your vehicle's model year and fuel type. Some areas of California require testing, while others do not. Check your California state page in this directory or your DMV's website to see if your address in Union City is in a testing area.
Most emissions programs require testing every one or two years, usually tied to registration renewal. Some vehicles are tested more frequently, and others are exempt for the first few model years. Use the California state page to see the current 2025 schedule for your vehicle type and registration area.
Prices vary by station and vehicle, but most emissions tests in Union City fall within the typical range for California. Many stations list pricing by phone or on their website, and some offer coupons or discounts. Use the listings above to contact a station directly for current pricing.
Requirements depend on vehicle type (gasoline, diesel, hybrid, electric), model year, and weight, as well as where your vehicle is registered in California. In many states, fully electric vehicles are exempt, newer vehicles are temporarily exempt, and certain older or specialty vehicles may have different rules. Check the California state page for the latest 2025 requirements.
Most stations in Union City ask you to bring your current registration or renewal notice, a valid photo ID, and proof of insurance if required by California. Make sure your vehicle is warmed up and the check engine light is off before you arrive.
If your vehicle fails, the station will provide a report showing the reason for failure (such as stored OBD-II codes or high tailpipe readings). In most programs, you must complete repairs and pass a retest before renewing your registration. Some states offer repair assistance, cost caps, or waivers. Details are listed on the California page in this directory.
In some states, certain vehicles are directed to specific station types (such as STAR or test-only centers). Unless your renewal notice or DMV instructions say otherwise, you can usually choose any licensed station in Union City. If you're unsure, ask the station when you call or check the instructions on your renewal notice.

Can't find what you're looking for? Contact our customer support team