---
title: "Ngoc Nguyen — Clean Truck Check, Fullerton, CA | CTC Finder"
description: "Ngoc Nguyen in Fullerton, 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/ngoc-nguyen-fullerton/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Ngoc Nguyen

Clean Truck Check tester in Fullerton, CA (Orange 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 | Fullerton, CA 92835 |
| County | Orange County |
| Phone | (714) 397-8025 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Ngoc Nguyen 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 Orange County

Ngoc Nguyen is one of 159 testing businesses in Orange County on CARB's public tester list. 146 of them offer mobile testing and 84 do smoke opacity tests. In Fullerton itself there are 8 listed businesses, 8 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 Ngoc Nguyen offer mobile Clean Truck Check testing?

Yes. Ngoc Nguyen 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 Ngoc Nguyen test a 2012 or older diesel truck?

Yes. Ngoc Nguyen 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 Ngoc Nguyen charge for a Clean Truck Check?

Ngoc Nguyen has not published prices with us; call (714) 397-8025 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 Ngoc Nguyen a CARB-credentialed tester?

Ngoc Nguyen 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

- **[Gerardo Reyes](https://ctcfinder.com/tester/gerardo-reyes-fullerton/)** — Fullerton, CA 92835 — (714) 906-0090 — 1 mi. Services: mobile testing, OBD testing.
- **[VNsocalmobile](https://ctcfinder.com/tester/vnsocalmobile-fullerton/)** — 1440 N Harbor Blvd, Fullerton, CA 92835 — (657) 500-9235 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Fernando Alvarez](https://ctcfinder.com/tester/fernando-alvarez-fullerton/)** — Fullerton, CA 92831 — (714) 823-1187 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Dillon mobile services](https://ctcfinder.com/tester/dillon-mobile-services-fullerton/)** — 507 S Balcom Ave, Fullerton, CA 92832 — (714) 357-1556 — 2 mi. Services: mobile testing.
- **[Fullerton Smog Center](https://ctcfinder.com/tester/fullerton-smog-center-fullerton/)** — 537 W Valencia Dr Suite C, Fullerton, CA 92832 — (714) 452-4126 — 2 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Auto logic](https://ctcfinder.com/tester/auto-logic-fullerton/)** — 4344 Artesia Ave, Fullerton, CA 92833 — (714) 403-5422 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.