---
title: "Serres corp----CLAYTON — Clean Truck Check, Sonoma, CA"
description: "Serres corp----CLAYTON in Sonoma, 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/serres-corp-clayton-sonoma/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Serres corp----CLAYTON

Clean Truck Check tester in Sonoma, 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 | 510 Chase St, Sonoma, CA 95476 |
| County | Sonoma County |
| Phone | (707) 934-7097 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Serres corp----CLAYTON 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 Carb Tester in Sonoma, about 1 mile away. [See listing](https://ctcfinder.com/tester/carb-tester-sonoma/).

## Clean Truck Check testers in Sonoma County

Serres corp----CLAYTON 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 Sonoma itself there are 5 listed businesses, 4 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 Serres corp----CLAYTON 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 [Carb Tester](https://ctcfinder.com/tester/carb-tester-sonoma/) (about 1 mile).

### Can Serres corp----CLAYTON test a 2012 or older diesel truck?

Yes. Serres corp----CLAYTON 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 Serres corp----CLAYTON charge for a Clean Truck Check?

Serres corp----CLAYTON has not published prices with us; call (707) 934-7097 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 Serres corp----CLAYTON a CARB-credentialed tester?

Serres corp----CLAYTON 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

- **[Carb Tester](https://ctcfinder.com/tester/carb-tester-sonoma/)** — 21707 8th St E, Sonoma, CA 95476 — (707) 772-9077 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Faustino](https://ctcfinder.com/tester/faustino-sonoma/)** — 23195 Maffei Rd, Sonoma, CA 95476 — (707) 953-3466 — 1 mi. Services: mobile testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Manzoni Inc](https://ctcfinder.com/tester/manzoni-inc-sonoma/)** — 27500 Skaggs Island Rd, Sonoma, CA 95476 — (707) 996-3685 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Shreddy Transport LLC](https://ctcfinder.com/tester/shreddy-transport-llc-sonoma/)** — 1270 Bragg St, Sonoma, CA 95476 — (707) 227-4492 — 1 mi. Services: mobile testing, OBD testing.
- **[Aaron Ramo](https://ctcfinder.com/tester/aaron-ramo-napa/)** — Napa, CA 94559 — (707) 225-7982 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Jones Family Mobile Diesel Repair](https://ctcfinder.com/tester/jones-family-mobile-diesel-repair-napa/)** — 933 Water St, Napa, CA 94559 — (410) 301-8518 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.