---
title: "TES — Clean Truck Check, Sonora, CA | CTC Finder"
description: "TES in Sonora, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/tes-sonora/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# TES

Clean Truck Check tester in Sonora, CA (Tuolumne 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 | 20849 Mechanical Dr, Sonora, CA 95370 |
| County | Tuolumne County |
| Phone | (209) 743-7301 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks TES 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 Sundborgs Repair Service in Sonora, about 1 mile away. [See listing](https://ctcfinder.com/tester/sundborgs-repair-service-sonora/).

## Clean Truck Check testers in Tuolumne County

TES is one of 5 testing businesses in Tuolumne County on CARB's public tester list. 4 of them offer mobile testing and 1 do smoke opacity tests. In Sonora 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 TES offer mobile Clean Truck Check testing?

Yes. TES 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 TES test a 2012 or older diesel truck?

TES does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Sundborgs Repair Service](https://ctcfinder.com/tester/sundborgs-repair-service-sonora/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does TES charge for a Clean Truck Check?

TES has not published prices with us; call (209) 743-7301 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 TES a CARB-credentialed tester?

TES 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

- **[Auto Tech and Tires](https://ctcfinder.com/tester/auto-tech-and-tires-sonora/)** — 18899 Microtronics Way, Sonora, CA 95370 — (209) 743-3699 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Brooke’s Mobile Truck Check](https://ctcfinder.com/tester/brookes-mobile-truck-check-sonora/)** — 20100 Highway 108, Sonora, CA 95370 — (209) 352-6200 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Sundborgs Repair Service](https://ctcfinder.com/tester/sundborgs-repair-service-sonora/)** — 18320 Wards Ferry Rd, Sonora, CA 95370 — (209) 768-7635 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[William Brown](https://ctcfinder.com/tester/william-brown-sonora/)** — Sonora, CA 95370 — (209) 540-7887 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[A1clean Check](https://ctcfinder.com/tester/a1clean-check-angels-camp/)** — 10668 Oak Valley Rd, Angels Camp, CA 95222 — (209) 630-1490 — 14 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Rorys Fire Apparatus & Diesel Repair](https://ctcfinder.com/tester/rorys-fire-apparatus-and-diesel-repair-angels-camp/)** — 303 N Baker St, Angels Camp, CA 95222 — (209) 628-5674 — 14 mi. Services: mobile testing, OBD testing, motorhome testing.