---
title: "Downey Smog CORP — Clean Truck Check, Downey, CA"
description: "Downey Smog CORP in Downey, CA is on CARB's Clean Truck Check tester list with 2 credentialed testers. Offers OBD testing, motorhome testing. Phone, address…"
url: "https://ctcfinder.com/tester/downey-smog-corp-downey/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Downey Smog CORP

Clean Truck Check tester in Downey, CA (Los Angeles 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 | 10801 Studebaker Rd, Downey, CA 90241 |
| County | Los Angeles County |
| Phone | (562) 863-4085 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 2 |
| Last verified | 2026-11-01 |

## Which trucks Downey Smog CORP 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 Itch Vargas in Downey, about 1 mile away. [See listing](https://ctcfinder.com/tester/itch-vargas-downey/).

If you need a tester at your yard, the nearest listed tester that offers mobile testing is Itch Vargas in Downey, about 1 mile away. [See listing](https://ctcfinder.com/tester/itch-vargas-downey/).

## Clean Truck Check testers in Los Angeles County

Downey Smog CORP is one of 516 testing businesses in Los Angeles County on CARB's public tester list. 465 of them offer mobile testing and 190 do smoke opacity tests. In Downey itself there are 9 listed businesses, 7 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 Downey Smog CORP offer mobile Clean Truck Check testing?

Not according to CARB's tester list; plan to bring the truck to the tester. The nearest listed mobile tester is [Itch Vargas](https://ctcfinder.com/tester/itch-vargas-downey/) (about 1 mile).

### Can Downey Smog CORP test a 2012 or older diesel truck?

Downey Smog CORP does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Itch Vargas](https://ctcfinder.com/tester/itch-vargas-downey/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Downey Smog CORP charge for a Clean Truck Check?

Downey Smog CORP has not published prices with us; call (562) 863-4085 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 Downey Smog CORP a CARB-credentialed tester?

Downey Smog CORP appears on CARB's public Clean Truck Check tester list with 2 credentialed testers, 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

- **[Itch Vargas](https://ctcfinder.com/tester/itch-vargas-downey/)** — Downey, CA 90241 — (562) 755-4085 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing.
- **[Rivera truck repair](https://ctcfinder.com/tester/rivera-truck-repair-downey/)** — Downey, CA 90241 — (323) 601-7739 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Eagle Smog](https://ctcfinder.com/tester/eagle-smog-downey/)** — 9476 Telegraph Rd, Downey, CA 90240 — (562) 360-0649 — 1 mi. Services: OBD testing, motorhome testing.
- **[OG services](https://ctcfinder.com/tester/og-services-downey/)** — 9127 Brookshire Avenue, Downey, CA 90240 — (323) 369-0501 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Onsite Fleet Mobile Compliance](https://ctcfinder.com/tester/onsite-fleet-mobile-compliance-downey/)** — 9554 Telegraph Rd, Downey, CA 90240 — (562) 261-6867 — 1 mi. Services: mobile testing, OBD testing.
- **[Osvaldo Delmuro](https://ctcfinder.com/tester/osvaldo-delmuro-downey/)** — Downey, CA 90240 — (562) 250-9351 — 1 mi. Services: mobile testing, OBD testing.