---
title: "Castro Smog Station — Clean Truck Check, San Francisco, CA"
description: "Castro Smog Station in San Francisco, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and…"
url: "https://ctcfinder.com/tester/castro-smog-station-san-francisco/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Castro Smog Station

Clean Truck Check tester in San Francisco, CA (San Francisco County).

> CTC Finder is an independent directory, not affiliated with CARB. Tester data: CARB Clean Truck Check public tester list, last checked November 1, 2026. Confirm services, hours and prices with the tester.

| Field | Value |
|---|---|
| Location | 376 Castro St, San Francisco, CA 94114 |
| County | San Francisco County |
| Phone | (415) 254-5896 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Castro Smog Station can test

| Your vehicle | Test required | This tester |
|---|---|---|
| Diesel, model year 2013 or newer | OBD scan | Yes |
| Alternative fuel (natural gas, propane), 2018 or newer | OBD scan | Yes |
| Diesel, model year 2012 or older (no OBD) | Smoke opacity test (SAE J1667) plus visual inspection | Not listed |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Auto Express Tow in San Francisco, about 4 miles away. [See listing](https://ctcfinder.com/tester/auto-express-tow-san-francisco/).

## Clean Truck Check testers in San Francisco County

Castro Smog Station is one of 7 testing businesses in San Francisco County on CARB's public tester list. 7 of them offer mobile testing and 1 do smoke opacity tests. In San Francisco itself there are 7 listed businesses, 7 of them mobile.

## When your truck is due

Most trucks test twice a year, on a schedule tied to the DMV registration expiration date. CARB says OBD trucks move to four tests a year beginning October 2027. California-registered (non-commercial) motorhomes and agricultural vehicles test once a year. See the [deadline guide](https://ctcfinder.com/guide/deadlines-2026-2027/). You can test up to 90 days before a deadline. Free email reminders: https://ctcfinder.com/reminders/

## Frequently asked questions

### Does Castro Smog Station offer mobile Clean Truck Check testing?

Yes. Castro Smog Station says on CARB's tester list that it offers mobile testing, so it can come to your yard or job site. Ask about a trip fee when you call.

### Can Castro Smog Station test a 2012 or older diesel truck?

Castro Smog Station does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Auto Express Tow](https://ctcfinder.com/tester/auto-express-tow-san-francisco/) (about 4 miles). Trucks from 2013 on get an OBD scan instead.

### How much does Castro Smog Station charge for a Clean Truck Check?

Castro Smog Station has not published prices with us; call (415) 254-5896 for a quote. Published California prices are usually $50–$135 per vehicle for an OBD test and $190–$200 for a smoke opacity test, plus CARB's annual fee ($32.13 in 2026). See the [cost guide](https://ctcfinder.com/guide/cost/).

### Is Castro Smog Station a CARB-credentialed tester?

Castro Smog Station appears on CARB's public Clean Truck Check tester list, last checked November 1, 2026. Only credentialed testers can submit results to CARB; after the test, confirm the passing result shows for your vehicle in CTC-VIS.

## Other testers nearby

- **[Dogpatch Biofuels](https://ctcfinder.com/tester/dogpatch-biofuels-san-francisco/)** — San Francisco, CA 94107 — (415) 505-6517 — 2 mi. Services: mobile testing, OBD testing.
- **[Jose Garcia](https://ctcfinder.com/tester/jose-garcia-san-francisco/)** — San Francisco, CA 94118 — (617) 953-5630 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Mobile Golden State Emissions San Francisco](https://ctcfinder.com/tester/mobile-golden-state-emissions-san-francisco-san-francisco/)** — 355 Berry St., San Francisco, CA 94158 — (925) 818-1831 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Auto Express Tow](https://ctcfinder.com/tester/auto-express-tow-san-francisco/)** — 270 Napoleon St, San Francisco, CA 94124 — (415) 407-8977 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Bay Area Mobile](https://ctcfinder.com/tester/bay-area-mobile-san-francisco/)** — 1245 Van Dyke Ave, San Francisco, CA 94124 — (415) 716-4175 — 4 mi. Services: mobile testing, OBD testing.
- **[GTC Clean Truck Check](https://ctcfinder.com/tester/gtc-clean-truck-check-san-francisco/)** — 2910 Griffith St, San Francisco, CA 94124 — (415) 225-8362 — 4 mi. Services: mobile testing, OBD testing.