---
title: "Black Diamond Clean Truck Check — Clean Truck Check, Oakley, CA"
description: "Black Diamond Clean Truck Check in Oakley, 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/black-diamond-clean-truck-check-oakley/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Black Diamond Clean Truck Check

Clean Truck Check tester in Oakley, CA (Contra Costa 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 | 3801 Daniel Dr, Oakley, CA 94561 |
| County | Contra Costa County |
| Phone | (925) 305-7586 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Black Diamond Clean Truck Check 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 Contra Costa County

Black Diamond Clean Truck Check is one of 61 testing businesses in Contra Costa County on CARB's public tester list. 57 of them offer mobile testing and 38 do smoke opacity tests. In Oakley itself there are 9 listed businesses, 9 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 Black Diamond Clean Truck Check offer mobile Clean Truck Check testing?

Yes. Black Diamond Clean Truck Check 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 Black Diamond Clean Truck Check test a 2012 or older diesel truck?

Yes. Black Diamond Clean Truck Check 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 Black Diamond Clean Truck Check charge for a Clean Truck Check?

Black Diamond Clean Truck Check has not published prices with us; call (925) 305-7586 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 Black Diamond Clean Truck Check a CARB-credentialed tester?

Black Diamond Clean Truck Check 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

- **[Creekside Notary & Consulting](https://ctcfinder.com/tester/creekside-notary-and-consulting-oakley/)** — 100 Heavenly Way, Oakley, CA 94561 — (925) 584-4493 — 1 mi. Services: mobile testing, OBD testing.
- **[E&J Truck and Equipment Repair](https://ctcfinder.com/tester/e-and-j-truck-and-equipment-repair-oakley/)** — Oakley, CA 94561 — (510) 393-2869 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[E&J Truck and Equipment Repair LLC](https://ctcfinder.com/tester/e-and-j-truck-and-equipment-repair-llc-oakley/)** — 115 Muir Ct, Oakley, CA 94561 — (707) 515-8539 — 1 mi. Services: mobile testing, OBD testing.
- **[Edward Chavez Pinzon](https://ctcfinder.com/tester/edward-chavez-pinzon-oakley/)** — Oakley, CA 94561 — (925) 759-8133 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing.
- **[JS Repair](https://ctcfinder.com/tester/js-repair-oakley/)** — 659 Lois Ln, Oakley, CA 94561 — (650) 745-6625 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Mobile Golden State Emissions Oakley](https://ctcfinder.com/tester/mobile-golden-state-emissions-oakley-oakley/)** — 5301 Elm Ln, Oakley, CA 94561 — (925) 354-4370 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.