---
title: "Fredrico Williams — Clean Truck Check, Northridge, CA"
description: "Fredrico Williams in Northridge, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and…"
url: "https://ctcfinder.com/tester/fredrico-williams-northridge/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Fredrico Williams

Clean Truck Check tester in Northridge, 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 | Northridge, CA 91324 |
| County | Los Angeles County |
| Phone | (619) 902-8069 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Fredrico Williams 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 Brendan Wyrock in Reseda, about 3 miles away. [See listing](https://ctcfinder.com/tester/brendan-wyrock-reseda/).

## Clean Truck Check testers in Los Angeles County

Fredrico Williams 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 Northridge itself there are 3 listed businesses, 3 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 Fredrico Williams offer mobile Clean Truck Check testing?

Yes. Fredrico Williams 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 Fredrico Williams test a 2012 or older diesel truck?

Fredrico Williams does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Brendan Wyrock](https://ctcfinder.com/tester/brendan-wyrock-reseda/) (about 3 miles). Trucks from 2013 on get an OBD scan instead.

### How much does Fredrico Williams charge for a Clean Truck Check?

Fredrico Williams has not published prices with us; call (619) 902-8069 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 Fredrico Williams a CARB-credentialed tester?

Fredrico Williams 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

- **[Automated CTC Services INC](https://ctcfinder.com/tester/automated-ctc-services-inc-northridge/)** — 8244 Sharuzi Ln, Northridge, CA 91325 — (818) 385-5006 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Eli's Mobil](https://ctcfinder.com/tester/elis-mobil-northridge/)** — Northridge, CA 91325 — (818) 618-2122 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Andranik Shamamyan](https://ctcfinder.com/tester/andranik-shamamyan-reseda/)** — Reseda, CA 91335 — (818) 427-2726 — 3 mi. Services: mobile testing, OBD testing.
- **[Brendan Wyrock](https://ctcfinder.com/tester/brendan-wyrock-reseda/)** — Reseda, CA 91335 — (818) 531-6090 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Eric Seaghat](https://ctcfinder.com/tester/eric-seaghat-reseda/)** — Reseda, CA 91335 — (818) 307-6011 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[INSTANT Truck Compliant](https://ctcfinder.com/tester/instant-truck-compliant-reseda/)** — 18747 sherman way 224, Reseda, CA 91335 — (818) 916-3153 — 3 mi. Services: mobile testing, OBD testing.