---
title: "Katy's Truck Tests — Clean Truck Check, Commerce, CA"
description: "Katy's Truck Tests in Commerce, 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/katys-truck-tests-commerce/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Katy's Truck Tests

Clean Truck Check tester in Commerce, 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 | 4638 E Washington Blvd, Commerce, CA 90040 |
| County | Los Angeles County |
| Phone | (323) 379-8707 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Katy's Truck Tests 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 Lowest Price CTC in Commerce, about 1 mile away. [See listing](https://ctcfinder.com/tester/lowest-price-ctc-commerce/).

## Clean Truck Check testers in Los Angeles County

Katy's Truck Tests 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 Commerce itself there are 7 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 Katy's Truck Tests offer mobile Clean Truck Check testing?

Yes. Katy's Truck Tests 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 Katy's Truck Tests test a 2012 or older diesel truck?

Katy's Truck Tests does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Lowest Price CTC](https://ctcfinder.com/tester/lowest-price-ctc-commerce/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Katy's Truck Tests charge for a Clean Truck Check?

Katy's Truck Tests has not published prices with us; call (323) 379-8707 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 Katy's Truck Tests a CARB-credentialed tester?

Katy's Truck Tests 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

- **[CTC Mobile Pros](https://ctcfinder.com/tester/ctc-mobile-pros-commerce/)** — 6741 Lanto Street, Commerce, CA 90040 — (562) 445-5632 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[JEE Trucking](https://ctcfinder.com/tester/jee-trucking-commerce/)** — 1449 S Sydney Dr, Commerce, CA 90040 — (323) 637-4252 — 1 mi. Services: mobile testing, OBD testing.
- **[Lowest Price CTC](https://ctcfinder.com/tester/lowest-price-ctc-commerce/)** — 5611 Sheila St, Commerce, CA 90040 — (424) 431-5360 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Universal Truck Parts LLC](https://ctcfinder.com/tester/universal-truck-parts-llc-commerce/)** — 4638 E Washington Blvd, Commerce, CA 90040 — (323) 216-6226 — 1 mi. Services: mobile testing, OBD testing.
- **[Universal Truck Parts LLC.- Commerce LAC](https://ctcfinder.com/tester/universal-truck-parts-llc-commerce-lac-commerce/)** — 4638 Washington st., Commerce, CA 90040 — (323) 356-4826 — 1 mi. Services: mobile testing, OBD testing.
- **[A&G Safety Alliance](https://ctcfinder.com/tester/a-and-g-safety-alliance-los-angeles/)** — 951 South Ford Boulevard, Los Angeles, CA 90022 — (562) 572-6969 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.