---
title: "Big iron — Clean Truck Check, Rosamond, CA | CTC Finder"
description: "Big iron in Rosamond, 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/big-iron-rosamond/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Big iron

Clean Truck Check tester in Rosamond, CA (Kern 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 | Rosamond, CA 93560 |
| County | Kern County |
| Phone | (661) 643-2427 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Big iron 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 Snail Race Transportation LLC in Rosamond, about 1 mile away. [See listing](https://ctcfinder.com/tester/snail-race-transportation-llc-rosamond/).

## Clean Truck Check testers in Kern County

Big iron is one of 107 testing businesses in Kern County on CARB's public tester list. 89 of them offer mobile testing and 53 do smoke opacity tests.

## 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 Big iron offer mobile Clean Truck Check testing?

Yes. Big iron 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 Big iron test a 2012 or older diesel truck?

Big iron does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Snail Race Transportation LLC](https://ctcfinder.com/tester/snail-race-transportation-llc-rosamond/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Big iron charge for a Clean Truck Check?

Big iron has not published prices with us; call (661) 643-2427 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 Big iron a CARB-credentialed tester?

Big iron 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

- **[Snail Race Transportation LLC](https://ctcfinder.com/tester/snail-race-transportation-llc-rosamond/)** — 2156 Manchester St, Rosamond, CA 93560 — (661) 537-5376 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Clean Truck Repair LLC](https://ctcfinder.com/tester/clean-truck-repair-llc-lancaster/)** — 43846 Marbella Street, Lancaster, CA 93536 — (661) 499-9343 — 11 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[J&S mobile clean truck checks](https://ctcfinder.com/tester/j-and-s-mobile-clean-truck-checks-lancaster/)** — 42504 62Nd Street West, Lancaster, CA 93536 — (661) 317-6206 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Jeremy Uribe](https://ctcfinder.com/tester/jeremy-uribe-lancaster/)** — Lancaster, CA 93536 — (805) 368-1622 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[JM Welding & Heavy Repair](https://ctcfinder.com/tester/jm-welding-and-heavy-repair-lancaster/)** — 25316 W Avenue B, Lancaster, CA 93536 — (661) 433-6210 — 11 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Jomars CTC](https://ctcfinder.com/tester/jomars-ctc-lancaster/)** — 42656 Tempo Drive, Lancaster, CA 93536 — (626) 481-7599 — 11 mi. Services: mobile testing, OBD testing, motorhome testing.