---
title: "Jose Diaz — Clean Truck Check, Soledad, CA | CTC Finder"
description: "Jose Diaz in Soledad, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing…"
url: "https://ctcfinder.com/tester/jose-diaz-soledad/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Jose Diaz

Clean Truck Check tester in Soledad, CA (Monterey 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 | Soledad, CA 93960 |
| County | Monterey County |
| Phone | (831) 821-0165 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Jose Diaz 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 Monterey County

Jose Diaz is one of 37 testing businesses in Monterey County on CARB's public tester list. 33 of them offer mobile testing and 11 do smoke opacity tests. In Soledad 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 Jose Diaz offer mobile Clean Truck Check testing?

Yes. Jose Diaz 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 Jose Diaz test a 2012 or older diesel truck?

Yes. Jose Diaz 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 Jose Diaz charge for a Clean Truck Check?

Jose Diaz has not published prices with us; call (831) 821-0165 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 Jose Diaz a CARB-credentialed tester?

Jose Diaz 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

- **[Express Truck and Trailer Services](https://ctcfinder.com/tester/express-truck-and-trailer-services-soledad/)** — 149 Nestles Rd, Soledad, CA 93960 — (831) 705-9207 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Premier Smogs](https://ctcfinder.com/tester/premier-smogs-soledad/)** — 801 Front St, Soledad, CA 93960 — (831) 305-3969 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Isaiah Banuelos](https://ctcfinder.com/tester/isaiah-banuelos-gonzales/)** — Gonzales, CA 93926 — (831) 261-5095 — 9 mi. Services: mobile testing, OBD testing.
- **[MH Parts and Equipment Services](https://ctcfinder.com/tester/mh-parts-and-equipment-services-gonzales/)** — 539 Delmonte Dr, Gonzales, CA 93926 — (831) 710-1878 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Salinas Valley Emissions LLC](https://ctcfinder.com/tester/salinas-valley-emissions-llc-gonzales/)** — 434 Brockmann Dr, Gonzales, CA 93926 — (831) 537-4397 — 9 mi. Services: mobile testing, OBD testing.
- **[JM Diesel Solutions](https://ctcfinder.com/tester/jm-diesel-solutions-greenfield/)** — 792 Cherry Ave, Greenfield, CA 93927 — (831) 585-8927 — 10 mi. Services: mobile testing, OBD testing, motorhome testing.