---
title: "Mj's Mobile Fleet LLC — Clean Truck Check, Stockton, CA"
description: "Mj's Mobile Fleet LLC in Stockton, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing. Phone…"
url: "https://ctcfinder.com/tester/mjs-mobile-fleet-llc-stockton/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Mj's Mobile Fleet LLC

Clean Truck Check tester in Stockton, CA (San Joaquin 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 | 2650 Wigwam Dr Suite J, Stockton, CA 95205 |
| County | San Joaquin County |
| Phone | (408) 661-1489 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Mj's Mobile Fleet 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 |

## Clean Truck Check testers in San Joaquin County

Mj's Mobile Fleet LLC is one of 124 testing businesses in San Joaquin County on CARB's public tester list. 111 of them offer mobile testing and 53 do smoke opacity tests. In Stockton itself there are 50 listed businesses, 43 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 Mj's Mobile Fleet LLC offer mobile Clean Truck Check testing?

Yes. Mj's Mobile Fleet LLC 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 Mj's Mobile Fleet LLC test a 2012 or older diesel truck?

Yes. Mj's Mobile Fleet 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 Mj's Mobile Fleet LLC charge for a Clean Truck Check?

Mj's Mobile Fleet LLC has not published prices with us; call (408) 661-1489 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 Mj's Mobile Fleet LLC a CARB-credentialed tester?

Mj's Mobile Fleet 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

- **[A&A Tow Services Inc](https://ctcfinder.com/tester/a-and-a-tow-services-inc-stockton/)** — 1011 N Broadway Ave, Ste AA, Stockton, CA 95205 — (209) 339-2331 — 1 mi. Services: mobile testing, OBD testing.
- **[Brannon Tire](https://ctcfinder.com/tester/brannon-tire-stockton/)** — 3730 N Wilson Way, Stockton, CA 95205 — (209) 570-9306 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[California's Diesel Mobile Testing LLC.](https://ctcfinder.com/tester/californias-diesel-mobile-testing-llc-stockton/)** — 2245 Learned Ave, Stockton, CA 95205 — (209) 649-1083 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Convenient Truck and Trailer Repair](https://ctcfinder.com/tester/convenient-truck-and-trailer-repair-stockton/)** — 1684 E Alpine Ave, Stockton, CA 95205 — (209) 715-9053 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Diesel Performance INC](https://ctcfinder.com/tester/diesel-performance-inc-stockton/)** — 2804 E Fremont St, Stockton, CA 95205 — (209) 946-0233 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Fateh Truck Repair](https://ctcfinder.com/tester/fateh-truck-repair-stockton/)** — 2915 Munford Ave, Stockton, CA 95205 — (916) 839-8888 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.