---
title: "SIA Auto — Clean Truck Check, Compton, CA | CTC Finder"
description: "SIA Auto in Compton, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing…"
url: "https://ctcfinder.com/tester/sia-auto-compton/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# SIA Auto

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 | 2120 E Rosecrans Ave, Compton, CA 90221 |
| County | Los Angeles County |
| Phone | (213) 413-6070 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks SIA Auto 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 Los Angeles County

SIA Auto 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 SIA Auto offer mobile Clean Truck Check testing?

Yes. SIA Auto 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 SIA Auto test a 2012 or older diesel truck?

Yes. SIA Auto 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 SIA Auto charge for a Clean Truck Check?

SIA Auto has not published prices with us; call (213) 413-6070 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 SIA Auto a CARB-credentialed tester?

SIA Auto 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

- **[Betty Soria](https://ctcfinder.com/tester/betty-soria-compton/)** — Compton, CA 90221 — (562) 618-7618 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Commercial Regulatory Management](https://ctcfinder.com/tester/commercial-regulatory-management-compton/)** — 1501 N Rose Ave, Compton, CA 90221 — (562) 922-5380 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[ED'S VEHICLE SAFETY Bernardo H Soria](https://ctcfinder.com/tester/eds-vehicle-safety-bernardo-h-soria-compton/)** — 15514 South Atlantic Avenue, Compton, CA 90221 — (310) 537-9786 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Joe Soria](https://ctcfinder.com/tester/joe-soria-compton/)** — Compton, CA 90221 — (310) 537-2400 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Kings Smog Test Only Station](https://ctcfinder.com/tester/kings-smog-test-only-station-compton/)** — 1012 South Long Beach Boulevard, Compton, CA 90221 — (323) 828-3709 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Marlon A Sosa](https://ctcfinder.com/tester/marlon-a-sosa-compton/)** — Compton, CA 90221 — (323) 637-1603 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.