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

# Auto Tech and Tires

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 | 18899 Microtronics Way, Sonora, CA 95370 |
| County | Tuolumne County |
| Phone | (209) 743-3699 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Auto Tech and Tires 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

Auto Tech and Tires 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 Auto Tech and Tires offer mobile Clean Truck Check testing?

Yes. Auto Tech and Tires 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 Auto Tech and Tires test a 2012 or older diesel truck?

Auto Tech and Tires 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 Auto Tech and Tires charge for a Clean Truck Check?

Auto Tech and Tires has not published prices with us; call (209) 743-3699 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 Auto Tech and Tires a CARB-credentialed tester?

Auto Tech and Tires 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

- **[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.
- **[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.