---
title: "So Cal CARB — Clean Truck Check, Compton, CA | CTC Finder"
description: "So Cal CARB in Compton, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/so-cal-carb-compton/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# So Cal CARB

Clean Truck Check tester in Compton, 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 | 640 West Knopf Street, Compton, CA 90222 |
| County | Los Angeles County |
| Phone | (424) 222-7722 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks So Cal CARB 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 Enrique Esquivel in Lynwood, about 2 miles away. [See listing](https://ctcfinder.com/tester/enrique-esquivel-lynwood/).

## Clean Truck Check testers in Los Angeles County

So Cal CARB 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 Compton itself there are 11 listed businesses, 10 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 So Cal CARB offer mobile Clean Truck Check testing?

Yes. So Cal CARB 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 So Cal CARB test a 2012 or older diesel truck?

So Cal CARB does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Enrique Esquivel](https://ctcfinder.com/tester/enrique-esquivel-lynwood/) (about 2 miles). Trucks from 2013 on get an OBD scan instead.

### How much does So Cal CARB charge for a Clean Truck Check?

So Cal CARB has not published prices with us; call (424) 222-7722 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 So Cal CARB a CARB-credentialed tester?

So Cal CARB 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

- **[Full Port Diagnostics](https://ctcfinder.com/tester/full-port-diagnostics-los-angeles/)** — 11428 Evers Ave, Los Angeles, CA 90059 — (323) 326-0416 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Jimenez Fleet Solutions](https://ctcfinder.com/tester/jimenez-fleet-solutions-los-angeles/)** — 320 E 116th St, Los Angeles, CA 90061 — (323) 212-5166 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Simply CTC SoCal LLC](https://ctcfinder.com/tester/simply-ctc-socal-llc-los-angeles/)** — 302 E 112th St, Los Angeles, CA 90061 — (323) 397-3480 — 2 mi. Services: mobile testing, OBD testing.
- **[South Bay Auto Center](https://ctcfinder.com/tester/south-bay-auto-center-los-angeles/)** — 13112 Athens Way, Los Angeles, CA 90061 — (310) 995-7793 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Alvaro Gonzalez](https://ctcfinder.com/tester/alvaro-gonzalez-lynwood/)** — Lynwood, CA 90262 — (323) 893-7747 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Car Depot Smog Check and Registrations](https://ctcfinder.com/tester/car-depot-smog-check-and-registrations-lynwood/)** — Lynwood, CA 90262 — (310) 638-1104 — 2 mi. Services: OBD testing.