---
title: "Roman Znak — Clean Truck Check, Joliet, IL | CTC Finder"
description: "Roman Znak in Joliet, IL is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/roman-znak-joliet-il/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Roman Znak

Clean Truck Check tester in Joliet, IL.

> 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 | Joliet, IL 60436 |
| Phone | (773) 732-2753 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Roman Znak 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 AIRLIMITS - Joliet-IL in Joliet, about 4 miles away. [See listing](https://ctcfinder.com/tester/airlimits-joliet-il-joliet-il/).

## Clean Truck Check testers in Illinois

Roman Znak is one of 65 testing businesses in Illinois on CARB's public tester list. 44 of them offer mobile testing and 19 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 Roman Znak offer mobile Clean Truck Check testing?

Yes. Roman Znak 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 Roman Znak test a 2012 or older diesel truck?

Roman Znak does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [AIRLIMITS - Joliet-IL](https://ctcfinder.com/tester/airlimits-joliet-il-joliet-il/) (about 4 miles). Trucks from 2013 on get an OBD scan instead.

### How much does Roman Znak charge for a Clean Truck Check?

Roman Znak has not published prices with us; call (773) 732-2753 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 Roman Znak a CARB-credentialed tester?

Roman Znak 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

- **[Lionstar Express Inc](https://ctcfinder.com/tester/lionstar-express-inc-joliet-il/)** — 1508 Baltz Dr, Joliet, IL 60431 — (224) 567-9381 — 4 mi. Services: mobile testing, OBD testing.
- **[SSM Trucking Inc.](https://ctcfinder.com/tester/ssm-trucking-inc-joliet-il/)** — 1508 Baltz Dr, Joliet, IL 60431 — (224) 567-9245 — 4 mi. Services: mobile testing, OBD testing.
- **[AIRLIMITS - Joliet-IL](https://ctcfinder.com/tester/airlimits-joliet-il-joliet-il/)** — Joliet, IL 60435 — (800) 788-5241 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[CHINGIZONE inc](https://ctcfinder.com/tester/chingizone-inc-joliet-il/)** — 300 Alessio Dr, Joliet, IL 60433 — (347) 241-2164 — 4 mi. Services: mobile testing, OBD testing.
- **[Diesel Dynasty Truck Repair LLC](https://ctcfinder.com/tester/diesel-dynasty-truck-repair-llc-joliet-il/)** — 21958 Cherry Hill Rd, Joliet, IL 60433 — (929) 454-5225 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Estes](https://ctcfinder.com/tester/estes-joliet-il/)** — 2300 Manhattan Rd, Joliet, IL 60433 — (708) 955-9476 — 4 mi. Services: OBD testing.