---
title: "Cuong Vuong — Clean Truck Check, Union City, CA | CTC Finder"
description: "Cuong Vuong in Union City, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/cuong-vuong-union-city/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Cuong Vuong

Clean Truck Check tester in Union City, CA (Alameda 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 | Union City, CA 94587 |
| County | Alameda County |
| Phone | (951) 433-0641 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Cuong Vuong 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 | Not listed |

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Bay Star Auto INC in Union City, about 1 mile away. [See listing](https://ctcfinder.com/tester/bay-star-auto-inc-union-city/).

## Clean Truck Check testers in Alameda County

Cuong Vuong is one of 85 testing businesses in Alameda County on CARB's public tester list. 79 of them offer mobile testing and 37 do smoke opacity tests. In Union City itself there are 6 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 Cuong Vuong offer mobile Clean Truck Check testing?

Yes. Cuong Vuong 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 Cuong Vuong test a 2012 or older diesel truck?

Cuong Vuong does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Bay Star Auto INC](https://ctcfinder.com/tester/bay-star-auto-inc-union-city/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Cuong Vuong charge for a Clean Truck Check?

Cuong Vuong has not published prices with us; call (951) 433-0641 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 Cuong Vuong a CARB-credentialed tester?

Cuong Vuong 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

- **[Bay Star Auto INC](https://ctcfinder.com/tester/bay-star-auto-inc-union-city/)** — 1275 Atlantic St, Union City, CA 94587 — (510) 489-3331 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Lally Truck &Tire Service INC](https://ctcfinder.com/tester/lally-truck-and-tire-service-inc-union-city/)** — 4600 Horner St, Union City, CA 94587 — (510) 557-1374 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Manjot Mashiana](https://ctcfinder.com/tester/manjot-mashiana-union-city/)** — Union City, CA 94587 — (510) 894-5468 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[SJ Diesel Smog Test](https://ctcfinder.com/tester/sj-diesel-smog-test-union-city/)** — 34625 Arroyo Dr, Union City, CA 94587 — (510) 314-9937 — 1 mi. Services: mobile testing, OBD testing.
- **[Total Multi Services INC](https://ctcfinder.com/tester/total-multi-services-inc-union-city/)** — 1780 Whipple Rd Suite 110, Union City, CA 94587 — (510) 767-7165 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Jaswinder Singh](https://ctcfinder.com/tester/jaswinder-singh-hayward/)** — Hayward, CA 94544 — (510) 579-7294 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.