---
title: "Samantha Downey — Clean Truck Check, Santa Rosa, CA"
description: "Samantha Downey in Santa Rosa, CA is on CARB's Clean Truck Check tester list. Offers OBD testing, smoke opacity (non-OBD) testing, motorhome testing. Phone…"
url: "https://ctcfinder.com/tester/samantha-downey-santa-rosa/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Samantha Downey

Clean Truck Check tester in Santa Rosa, CA (Sonoma 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 | Santa Rosa, CA 95404 |
| County | Sonoma County |
| Phone | (707) 703-7380 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Samantha Downey 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 | Yes |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

If you need a tester at your yard, the nearest listed tester that offers mobile testing is Angelica Onate in Santa Rosa, about 1 mile away. [See listing](https://ctcfinder.com/tester/angelica-onate-santa-rosa/).

## Clean Truck Check testers in Sonoma County

Samantha Downey is one of 28 testing businesses in Sonoma County on CARB's public tester list. 19 of them offer mobile testing and 14 do smoke opacity tests. In Santa Rosa itself there are 17 listed businesses, 11 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 Samantha Downey offer mobile Clean Truck Check testing?

Not according to CARB's tester list; plan to bring the truck to the tester. The nearest listed mobile tester is [Angelica Onate](https://ctcfinder.com/tester/angelica-onate-santa-rosa/) (about 1 mile).

### Can Samantha Downey test a 2012 or older diesel truck?

Yes. Samantha Downey lists smoke opacity testing, the test CARB requires for diesel trucks of model year 2012 and older (no OBD). See [OBD vs smoke opacity](https://ctcfinder.com/guide/obd-vs-smoke-opacity-test/).

### How much does Samantha Downey charge for a Clean Truck Check?

Samantha Downey has not published prices with us; call (707) 703-7380 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 Samantha Downey a CARB-credentialed tester?

Samantha Downey 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

- **[Angelica Onate](https://ctcfinder.com/tester/angelica-onate-santa-rosa/)** — Santa Rosa, CA 95404 — (707) 888-8066 — 1 mi. Services: mobile testing.
- **[Breen](https://ctcfinder.com/tester/breen-santa-rosa/)** — 4122 Wallace Rd, Santa Rosa, CA 95404 — (415) 374-3282 — 1 mi. Services: mobile testing, motorhome testing.
- **[D Bar Diesel Truck Repair Corp](https://ctcfinder.com/tester/d-bar-diesel-truck-repair-corp-santa-rosa/)** — 5535 Idlewood Dr, Santa Rosa, CA 95404 — (707) 292-7934 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[David Bertoli](https://ctcfinder.com/tester/david-bertoli-santa-rosa/)** — Santa Rosa, CA 95404 — (707) 321-4715 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Hensley's Auto](https://ctcfinder.com/tester/hensleys-auto-santa-rosa/)** — 468 Yolanda Ave #915, Santa Rosa, CA 95404 — (707) 544-1750 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Clifford Cole](https://ctcfinder.com/tester/clifford-cole-santa-rosa/)** — Santa Rosa, CA 95403 — (707) 888-3057 — 4 mi. Services: mobile testing, OBD testing, motorhome testing.