---
title: "Julian’s Mobile Service — Clean Truck Check, Los Angeles, CA"
description: "Julian’s Mobile Service in Los Angeles, CA is on CARB's Clean Truck Check tester list. Offers OBD testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/julians-mobile-service-los-angeles/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Julian’s Mobile Service

Clean Truck Check tester in Los Angeles, 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 | 2323 Porter Street, Los Angeles, CA 90021 |
| County | Los Angeles County |
| Phone | (323) 707-4652 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Julian’s Mobile Service 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 Check in Los Angeles, about 1 mile away. [See listing](https://ctcfinder.com/tester/lowest-price-ctc-check-los-angeles/).

If you need a tester at your yard, the nearest listed tester that offers mobile testing is cleantruck.net in Los Angeles, about 1 mile away. [See listing](https://ctcfinder.com/tester/cleantruck-net-los-angeles/).

## Clean Truck Check testers in Los Angeles County

Julian’s Mobile Service 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 Los Angeles itself there are 69 listed businesses, 60 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 Julian’s Mobile Service offer mobile Clean Truck Check testing?

Not according to CARB's tester list; plan to bring the truck to the tester. The nearest listed mobile tester is [cleantruck.net](https://ctcfinder.com/tester/cleantruck-net-los-angeles/) (about 1 mile).

### Can Julian’s Mobile Service test a 2012 or older diesel truck?

Julian’s Mobile Service does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Lowest Price CTC Check](https://ctcfinder.com/tester/lowest-price-ctc-check-los-angeles/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Julian’s Mobile Service charge for a Clean Truck Check?

Julian’s Mobile Service has not published prices with us; call (323) 707-4652 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 Julian’s Mobile Service a CARB-credentialed tester?

Julian’s Mobile Service 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

- **[cleantruck.net](https://ctcfinder.com/tester/cleantruck-net-los-angeles/)** — Los Angeles, CA 90021 — (310) 571-7093 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Lowest Price CTC Check](https://ctcfinder.com/tester/lowest-price-ctc-check-los-angeles/)** — 1219 South Santa Fe Avenue, Los Angeles, CA 90021 — (424) 431-5360 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[EJMG Services](https://ctcfinder.com/tester/ejmg-services-los-angeles/)** — 4260 Hooper Ave, Los Angeles, CA 90011 — (213) 364-3555 — 2 mi. Services: mobile testing, OBD testing.
- **[SoCal Smog Testing](https://ctcfinder.com/tester/socal-smog-testing-los-angeles/)** — 5602 S Central Ave, Los Angeles, CA 90011 — (310) 720-6683 — 2 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Walker Mobile CTC](https://ctcfinder.com/tester/walker-mobile-ctc-los-angeles/)** — Los Angeles, CA 90011 — (323) 374-3041 — 2 mi. Services: mobile testing, OBD testing.
- **[Yanes Mobile Services and Repairs](https://ctcfinder.com/tester/yanes-mobile-services-and-repairs-los-angeles/)** — 306 E 50th St, Los Angeles, CA 90011 — (626) 428-1863 — 2 mi. Services: mobile testing, OBD testing.