---
title: "Sam's Mobile Diagnostics — Clean Truck Check, Carlsbad, CA"
description: "Sam's Mobile Diagnostics in Carlsbad, 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/sams-mobile-diagnostics-carlsbad/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Sam's Mobile Diagnostics

Clean Truck Check tester in Carlsbad, CA (San Diego 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 | 2330 Via Francisca, Carlsbad, CA 92008 |
| County | San Diego County |
| Phone | (442) 385-2319 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Sam's Mobile Diagnostics 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 San Diego County

Sam's Mobile Diagnostics is one of 178 testing businesses in San Diego County on CARB's public tester list. 157 of them offer mobile testing and 91 do smoke opacity tests. In Carlsbad itself there are 3 listed businesses, 3 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 Sam's Mobile Diagnostics offer mobile Clean Truck Check testing?

Yes. Sam's Mobile Diagnostics 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 Sam's Mobile Diagnostics test a 2012 or older diesel truck?

Yes. Sam's Mobile Diagnostics 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 Sam's Mobile Diagnostics charge for a Clean Truck Check?

Sam's Mobile Diagnostics has not published prices with us; call (442) 385-2319 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 Sam's Mobile Diagnostics a CARB-credentialed tester?

Sam's Mobile Diagnostics 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

- **[Ken Grody Ford](https://ctcfinder.com/tester/ken-grody-ford-carlsbad/)** — Carlsbad, CA 92008 — (760) 402-3190 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[William Sarmiento](https://ctcfinder.com/tester/william-sarmiento-carlsbad/)** — Carlsbad, CA 92008 — (442) 416-6384 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Arroyo Trucking Consultants llc](https://ctcfinder.com/tester/arroyo-trucking-consultants-llc-oceanside/)** — 3637 Esplanade Street, Oceanside, CA 92056 — (760) 613-1079 — 4 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[California Environmental Solutions](https://ctcfinder.com/tester/california-environmental-solutions-oceanside/)** — 1125 Ocean Ridge Court, Oceanside, CA 92056 — (661) 619-3739 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[CTC Pro Mobile](https://ctcfinder.com/tester/ctc-pro-mobile-oceanside/)** — 1611 Calle Las Casas, Oceanside, CA 92056 — (442) 222-1530 — 4 mi. Services: mobile testing, OBD testing.
- **[Mobile Diesel Testing OBD](https://ctcfinder.com/tester/mobile-diesel-testing-obd-oceanside/)** — 3641 Seaflower Lane, Oceanside, CA 92056 — (760) 847-3507 — 4 mi. Services: mobile testing, OBD testing, motorhome testing.