Test Only station Sonoma, Sonoma County
Four Corners Service
20500 Broadway, Sonoma, CA 95476
Four Corners Service is a licensed test only smog check station at 20500 Broadway in Sonoma and is STAR certified. Its state license dates to 2023, which makes it number 8 of 8 Sonoma stations by time licensed.
What this station can do
This is a test only station. It can run your smog check and certify a pass, but it cannot fix a car that fails.
Because it is STAR certified, it can test cars the DMV directed to a STAR station. What STAR means.
License check
You can look up this station's license on the state's own site. Search the number below at search.dca.ca.gov. A smog check only counts if the station is licensed on the day of your test.
- Smog station license TC 100412
- Auto repair registration ARD 100412
- License expires 2027-02-28
Own this station? Fix your hours, phone or services.
Before you go
- Bring your DMV renewal notice if you have one, and the car's registration.
- Drive at least 20 minutes first so the engine is warm.
- If the check engine light is on, you will fail. Here is why.
- Prices are set by each station. The statewide average and what drives it are in our price guide.