---
title: "Johns' Group LLC — Clean Truck Check, Fortuna, CA"
description: "Johns' Group LLC in Fortuna, CA is on CARB's Clean Truck Check tester list. Offers OBD testing, smoke opacity (non-OBD) testing. Phone, address and nearby…"
url: "https://ctcfinder.com/tester/johns-group-llc-fortuna/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Johns' Group LLC

Clean Truck Check tester in Fortuna, CA (Humboldt 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 | 3651 Rohnerville Rd, Fortuna, CA 95540 |
| County | Humboldt County |
| Phone | (707) 725-3898 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Johns' Group LLC 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 | Not listed |

If you need a tester at your yard, the nearest listed tester that offers mobile testing is Austin Will in Fortuna, about 1 mile away. [See listing](https://ctcfinder.com/tester/austin-will-fortuna/).

## Clean Truck Check testers in Humboldt County

Johns' Group LLC is one of 20 testing businesses in Humboldt County on CARB's public tester list. 16 of them offer mobile testing and 13 do smoke opacity tests. In Fortuna itself there are 7 listed businesses, 6 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 Johns' Group LLC 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 [Austin Will](https://ctcfinder.com/tester/austin-will-fortuna/) (about 1 mile).

### Can Johns' Group LLC test a 2012 or older diesel truck?

Yes. Johns' Group LLC 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 Johns' Group LLC charge for a Clean Truck Check?

Johns' Group LLC has not published prices with us; call (707) 725-3898 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 Johns' Group LLC a CARB-credentialed tester?

Johns' Group LLC 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

- **[Austin Will](https://ctcfinder.com/tester/austin-will-fortuna/)** — Fortuna, CA 95540 — (707) 768-3781 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Cody clean truck test](https://ctcfinder.com/tester/cody-clean-truck-test-fortuna/)** — 354 11th St, Fortuna, CA 95540 — (707) 617-8618 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Eri Marroquin](https://ctcfinder.com/tester/eri-marroquin-fortuna/)** — Fortuna, CA 95540 — (714) 380-2971 — 1 mi. Services: mobile testing, OBD testing.
- **[JACKSONS Mobile Welding and Equipment Repair](https://ctcfinder.com/tester/jacksons-mobile-welding-and-equipment-repair-fortuna/)** — 207 Rebecca Ln, Fortuna, CA 95540 — (707) 499-0877 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Peterson tractor](https://ctcfinder.com/tester/peterson-tractor-fortuna/)** — Fortuna, CA 95540 — (530) 560-9708 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Peterson Tractor CO](https://ctcfinder.com/tester/peterson-tractor-co-fortuna/)** — 1700 Alamar Way, Fortuna, CA 95540 — (707) 798-7627 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.