---
title: "Mobile Diesel Doctors INC — Clean Truck Check, Stockton, CA"
description: "Mobile Diesel Doctors INC in Stockton, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and…"
url: "https://ctcfinder.com/tester/mobile-diesel-doctors-inc-stockton/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Mobile Diesel Doctors INC

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 | 265 S Hinkley Ave, Stockton, CA 95215 |
| County | San Joaquin County |
| Phone | (888) 734-3735 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Mobile Diesel Doctors INC 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 Felipe Chavez in Stockton, about 1 mile away. [See listing](https://ctcfinder.com/tester/felipe-chavez-stockton/).

## Clean Truck Check testers in San Joaquin County

Mobile Diesel Doctors INC 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 Mobile Diesel Doctors INC offer mobile Clean Truck Check testing?

Yes. Mobile Diesel Doctors INC 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 Mobile Diesel Doctors INC test a 2012 or older diesel truck?

Mobile Diesel Doctors INC does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Felipe Chavez](https://ctcfinder.com/tester/felipe-chavez-stockton/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Mobile Diesel Doctors INC charge for a Clean Truck Check?

Mobile Diesel Doctors INC has not published prices with us; call (888) 734-3735 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 Mobile Diesel Doctors INC a CARB-credentialed tester?

Mobile Diesel Doctors INC 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

- **[Felipe Chavez](https://ctcfinder.com/tester/felipe-chavez-stockton/)** — Stockton, CA 95215 — (209) 663-5542 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Noe Rivera](https://ctcfinder.com/tester/noe-rivera-stockton/)** — Stockton, CA 95215 — (209) 337-8506 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Ryan Truck Trailer Mobile Service](https://ctcfinder.com/tester/ryan-truck-trailer-mobile-service-stockton/)** — 3612 Farmington Rd, Stockton, CA 95215 — (209) 518-3124 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Trevor Nichols](https://ctcfinder.com/tester/trevor-nichols-stockton/)** — Stockton, CA 95215 — (209) 620-7066 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Western Truck](https://ctcfinder.com/tester/western-truck-stockton/)** — 3333 S 99 Frontage Rd, Stockton, CA 95215 — (209) 323-7300 — 1 mi. Services: mobile testing.
- **[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 — 6 mi. Services: mobile testing, OBD testing.