---
title: "D's Diesel N' Off- Road — Clean Truck Check, Paso Robles, CA"
description: "D's Diesel N' Off- Road in Paso Robles, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address…"
url: "https://ctcfinder.com/tester/ds-diesel-n-off-road-paso-robles/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# D's Diesel N' Off- Road

Clean Truck Check tester in Paso Robles, CA (San Luis Obispo 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 | 6085 Eucalyptus Rd, Paso Robles, CA 93446 |
| County | San Luis Obispo County |
| Phone | (805) 286-8116 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks D's Diesel N' Off- Road 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 Dye's Mobile Diesel Smoke Testing in Paso Robles, about 1 mile away. [See listing](https://ctcfinder.com/tester/dyes-mobile-diesel-smoke-testing-paso-robles/).

## Clean Truck Check testers in San Luis Obispo County

D's Diesel N' Off- Road is one of 25 testing businesses in San Luis Obispo County on CARB's public tester list. 22 of them offer mobile testing and 9 do smoke opacity tests. In Paso Robles itself there are 5 listed businesses, 5 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 D's Diesel N' Off- Road offer mobile Clean Truck Check testing?

Yes. D's Diesel N' Off- Road 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 D's Diesel N' Off- Road test a 2012 or older diesel truck?

D's Diesel N' Off- Road does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Dye's Mobile Diesel Smoke Testing](https://ctcfinder.com/tester/dyes-mobile-diesel-smoke-testing-paso-robles/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does D's Diesel N' Off- Road charge for a Clean Truck Check?

D's Diesel N' Off- Road has not published prices with us; call (805) 286-8116 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 D's Diesel N' Off- Road a CARB-credentialed tester?

D's Diesel N' Off- Road 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

- **[Coops Carb Compliance LLC](https://ctcfinder.com/tester/coops-carb-compliance-llc-paso-robles/)** — 6520 Long Hill Pl, Paso Robles, CA 93446 — (620) 778-2208 — 1 mi. Services: mobile testing, OBD testing.
- **[Dye's Mobile Diesel Smoke Testing](https://ctcfinder.com/tester/dyes-mobile-diesel-smoke-testing-paso-robles/)** — 655 Cripple Creek Rd, Paso Robles, CA 93446 — (805) 835-2893 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Kings Oil Tools](https://ctcfinder.com/tester/kings-oil-tools-paso-robles/)** — Paso Robles, CA 93446 — (805) 610-2796 — 1 mi. Services: mobile testing, OBD testing.
- **[Mid-State Repair & Service](https://ctcfinder.com/tester/mid-state-repair-and-service-paso-robles/)** — 1946 Wood Duck Ln, Paso Robles, CA 93446 — (805) 729-1068 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Mtech Unlimited](https://ctcfinder.com/tester/mtech-unlimited-templeton/)** — Templeton, CA 93465 — (805) 550-8744 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Affordable Auto Care](https://ctcfinder.com/tester/affordable-auto-care-atascadero/)** — 4495 Traffic Way, Atascadero, CA 93422 — (805) 258-1495 — 13 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.