---
title: "Sundborgs Repair Service — Clean Truck Check, Sonora, CA"
description: "Sundborgs Repair Service in Sonora, CA is on CARB's Clean Truck Check tester list. Offers OBD testing, smoke opacity (non-OBD) testing, motorhome testing…"
url: "https://ctcfinder.com/tester/sundborgs-repair-service-sonora/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Sundborgs Repair Service

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 | 18320 Wards Ferry Rd, Sonora, CA 95370 |
| County | Tuolumne County |
| Phone | (209) 768-7635 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Sundborgs Repair Service 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 Auto Tech and Tires in Sonora, about 1 mile away. [See listing](https://ctcfinder.com/tester/auto-tech-and-tires-sonora/).

## Clean Truck Check testers in Tuolumne County

Sundborgs Repair Service 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 Sundborgs Repair Service 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 [Auto Tech and Tires](https://ctcfinder.com/tester/auto-tech-and-tires-sonora/) (about 1 mile).

### Can Sundborgs Repair Service test a 2012 or older diesel truck?

Yes. Sundborgs Repair Service 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 Sundborgs Repair Service charge for a Clean Truck Check?

Sundborgs Repair Service has not published prices with us; call (209) 768-7635 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 Sundborgs Repair Service a CARB-credentialed tester?

Sundborgs Repair Service 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.
- **[TES](https://ctcfinder.com/tester/tes-sonora/)** — 20849 Mechanical Dr, Sonora, CA 95370 — (209) 743-7301 — 1 mi. Services: mobile testing, 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.