---
title: "The Diesel Doc LLC — Clean Truck Check, Perris, CA"
description: "The Diesel Doc LLC in Perris, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome…"
url: "https://ctcfinder.com/tester/the-diesel-doc-llc-perris/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# The Diesel Doc LLC

Clean Truck Check tester in Perris, CA (Riverside 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 | 3945 Coral Haven Ct, Perris, CA 92571 |
| County | Riverside County |
| Phone | (323) 781-0130 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks The Diesel Doc LLC 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 Riverside County

The Diesel Doc LLC is one of 251 testing businesses in Riverside County on CARB's public tester list. 233 of them offer mobile testing and 102 do smoke opacity tests. In Perris itself there are 18 listed businesses, 16 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 The Diesel Doc LLC offer mobile Clean Truck Check testing?

Yes. The Diesel Doc LLC 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 The Diesel Doc LLC test a 2012 or older diesel truck?

Yes. The Diesel Doc LLC 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 The Diesel Doc LLC charge for a Clean Truck Check?

The Diesel Doc LLC has not published prices with us; call (323) 781-0130 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 The Diesel Doc LLC a CARB-credentialed tester?

The Diesel Doc LLC 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

- **[aguilares LLC](https://ctcfinder.com/tester/aguilares-llc-perris/)** — 2066 Willowbrook Ln, Perris, CA 92571 — (949) 245-4300 — 1 mi. Services: OBD testing.
- **[All Smogged Motors](https://ctcfinder.com/tester/all-smogged-motors-perris/)** — 425 W Rider St Suite B 3, Perris, CA 92571 — (951) 790-2232 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[California Emission Solutions llc](https://ctcfinder.com/tester/california-emission-solutions-llc-perris/)** — 3645 Alhambra Ln, Perris, CA 92571 — (951) 990-4074 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Faisal Bhuiyan](https://ctcfinder.com/tester/faisal-bhuiyan-perris/)** — Perris, CA 92571 — (909) 561-2872 — 1 mi. Services: mobile testing, OBD testing.
- **[HD Smog Pro LLC](https://ctcfinder.com/tester/hd-smog-pro-llc-perris/)** — 2197 Murrieta Rd, Perris, CA 92571 — (951) 664-2574 — 1 mi. Services: mobile testing, motorhome testing.
- **[Inland Empire Diesel Smog](https://ctcfinder.com/tester/inland-empire-diesel-smog-perris/)** — 1133 Moraga Ave, Perris, CA 92571 — (562) 310-0036 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.