---
title: "Johnson Enterprises — Clean Truck Check, San Andreas, CA"
description: "Johnson Enterprises in San Andreas, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing…"
url: "https://ctcfinder.com/tester/johnson-enterprises-san-andreas/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Johnson Enterprises

Clean Truck Check tester in San Andreas, CA (Calaveras 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 | 1801 Leonard Ct, San Andreas, CA 95249 |
| County | Calaveras County |
| Phone | (209) 890-0369 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Johnson Enterprises 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 |

## Clean Truck Check testers in Calaveras County

Johnson Enterprises is one of 8 testing businesses in Calaveras County on CARB's public tester list. 8 of them offer mobile testing and 4 do smoke opacity tests.

## 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 Johnson Enterprises offer mobile Clean Truck Check testing?

Yes. Johnson Enterprises 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 Johnson Enterprises test a 2012 or older diesel truck?

Yes. Johnson Enterprises 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 Johnson Enterprises charge for a Clean Truck Check?

Johnson Enterprises has not published prices with us; call (209) 890-0369 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 Johnson Enterprises a CARB-credentialed tester?

Johnson Enterprises 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

- **[A1clean Check](https://ctcfinder.com/tester/a1clean-check-angels-camp/)** — 10668 Oak Valley Rd, Angels Camp, CA 95222 — (209) 630-1490 — 10 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 — 10 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Wayne's](https://ctcfinder.com/tester/waynes-angels-camp/)** — Angels Camp, CA 95222 — (209) 743-8104 — 10 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[A&T Mobile Vin Verification](https://ctcfinder.com/tester/a-and-t-mobile-vin-verification-valley-springs/)** — Valley Springs, CA 95252 — (209) 810-2882 — 12 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Hunter Moody](https://ctcfinder.com/tester/hunter-moody-valley-springs/)** — Valley Springs, CA 95252 — (209) 217-2691 — 12 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Sierra Services](https://ctcfinder.com/tester/sierra-services-valley-springs/)** — 5010 Olive Orchard Road, Valley Springs, CA 95252 — (209) 914-0388 — 12 mi. Services: mobile testing, OBD testing, motorhome testing.