---
title: "Roys Towing — Clean Truck Check, Thousand Oaks, CA"
description: "Roys Towing in Thousand Oaks, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby…"
url: "https://ctcfinder.com/tester/roys-towing-thousand-oaks/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Roys Towing

Clean Truck Check tester in Thousand Oaks, CA (Ventura 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 | 1344 E Thousand Oaks Blvd, Thousand Oaks, CA 91362 |
| County | Ventura County |
| Phone | (805) 443-6639 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Roys Towing 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 Smogz4less-ctc in Thousand Oaks, about 1 mile away. [See listing](https://ctcfinder.com/tester/smogz4less-ctc-thousand-oaks/).

## Clean Truck Check testers in Ventura County

Roys Towing is one of 68 testing businesses in Ventura County on CARB's public tester list. 61 of them offer mobile testing and 21 do smoke opacity tests. In Thousand Oaks 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 Roys Towing offer mobile Clean Truck Check testing?

Yes. Roys Towing 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 Roys Towing test a 2012 or older diesel truck?

Roys Towing does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Smogz4less-ctc](https://ctcfinder.com/tester/smogz4less-ctc-thousand-oaks/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Roys Towing charge for a Clean Truck Check?

Roys Towing has not published prices with us; call (805) 443-6639 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 Roys Towing a CARB-credentialed tester?

Roys Towing 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

- **[Michael Gil](https://ctcfinder.com/tester/michael-gil-thousand-oaks/)** — Thousand Oaks, CA 91362 — (424) 373-2726 — 1 mi. Services: mobile testing, OBD testing.
- **[Smogz4less-ctc](https://ctcfinder.com/tester/smogz4less-ctc-thousand-oaks/)** — 3111 E Thousand Oaks Blvd#5A, Thousand Oaks, CA 91362 — (805) 670-3883 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[A1 Emissions](https://ctcfinder.com/tester/a1-emissions-simi-valley/)** — 1933 3rd St, Simi Valley, CA 93065 — (805) 857-1085 — 6 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Juans Truck Smog](https://ctcfinder.com/tester/juans-truck-smog-simi-valley/)** — 679 E Easy St, Simi Valley, CA 93065 — (442) 322-0055 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[KC Truck Smog](https://ctcfinder.com/tester/kc-truck-smog-simi-valley/)** — 939 Talbert Ave, Simi Valley, CA 93065 — (805) 404-8842 — 6 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Simi Smog Doc](https://ctcfinder.com/tester/simi-smog-doc-simi-valley/)** — 1382 E Los Angeles Ave Suite C, Simi Valley, CA 93065 — (805) 509-3143 — 6 mi. Services: mobile testing, OBD testing, motorhome testing.