---
title: "Roland Castillo — Clean Truck Check, Norwalk, CA"
description: "Roland Castillo in Norwalk, 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/roland-castillo-norwalk/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Roland Castillo

Clean Truck Check tester in Norwalk, 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 | Norwalk, CA 90650 |
| County | Los Angeles County |
| Phone | (562) 418-8450 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Roland Castillo 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 Intermodal Safety Inspections in Norwalk, about 1 mile away. [See listing](https://ctcfinder.com/tester/intermodal-safety-inspections-norwalk/).

## Clean Truck Check testers in Los Angeles County

Roland Castillo 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 Norwalk itself there are 5 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 Roland Castillo offer mobile Clean Truck Check testing?

Yes. Roland Castillo 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 Roland Castillo test a 2012 or older diesel truck?

Roland Castillo does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Intermodal Safety Inspections](https://ctcfinder.com/tester/intermodal-safety-inspections-norwalk/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Roland Castillo charge for a Clean Truck Check?

Roland Castillo has not published prices with us; call (562) 418-8450 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 Roland Castillo a CARB-credentialed tester?

Roland Castillo 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

- **[Intermodal Safety Inspections](https://ctcfinder.com/tester/intermodal-safety-inspections-norwalk/)** — 12139 Gard Ave, Norwalk, CA 90650 — (562) 246-4195 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Marvin Moran](https://ctcfinder.com/tester/marvin-moran-norwalk/)** — Norwalk, CA 90650 — (562) 249-8133 — 1 mi. Services: mobile testing, OBD testing.
- **[Quick Mobile Diesel Testing](https://ctcfinder.com/tester/quick-mobile-diesel-testing-norwalk/)** — 13322 Markdale Ave, Norwalk, CA 90650 — (562) 843-3415 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Scalehisales](https://ctcfinder.com/tester/scalehisales-norwalk/)** — 13427 Pumice St, Norwalk, CA 90650 — (657) 213-8378 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[April Freight](https://ctcfinder.com/tester/april-freight-santa-fe-springs/)** — 12848 Imperial Hwy, Santa Fe Springs, CA 90670 — (626) 828-1472 — 2 mi. Services: OBD testing.
- **[Diesel Exhaust & Emissions](https://ctcfinder.com/tester/diesel-exhaust-and-emissions-santa-fe-springs/)** — 11039 Shoemaker Ave, Santa Fe Springs, CA 90670 — (562) 734-6302 — 2 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.