---
title: "John Cadena — Clean Truck Check, Seguin, TX | CTC Finder"
description: "John Cadena in Seguin, TX is on CARB's Clean Truck Check tester list. Offers mobile testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/john-cadena-seguin-tx/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# John Cadena

Clean Truck Check tester in Seguin, TX.

> 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 | Seguin, TX 78155 |
| Phone | (806) 275-0022 |
| Mobile testing | Yes |
| OBD testing | No |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks John Cadena can test

| Your vehicle | Test required | This tester |
|---|---|---|
| Diesel, model year 2013 or newer | OBD scan | Not listed |
| Alternative fuel (natural gas, propane), 2018 or newer | OBD scan | Not listed |
| 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 WD Truck and Trailer Care in San Antonio, about 28 miles away. [See listing](https://ctcfinder.com/tester/wd-truck-and-trailer-care-san-antonio-tx/).

## Clean Truck Check testers in Texas

John Cadena is one of 46 testing businesses in Texas on CARB's public tester list. 37 of them offer mobile testing and 18 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 John Cadena offer mobile Clean Truck Check testing?

Yes. John Cadena 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 John Cadena test a 2012 or older diesel truck?

John Cadena does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [WD Truck and Trailer Care](https://ctcfinder.com/tester/wd-truck-and-trailer-care-san-antonio-tx/) (about 28 miles). Trucks from 2013 on get an OBD scan instead.

### How much does John Cadena charge for a Clean Truck Check?

John Cadena has not published prices with us; call (806) 275-0022 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 John Cadena a CARB-credentialed tester?

John Cadena 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

- **[TA Truck Serivce](https://ctcfinder.com/tester/ta-truck-serivce-new-braunfels-tx/)** — 4817 Interstate 35 N, New Braunfels, TX 78130 — (817) 455-5307 — 13 mi. Services: OBD testing.
- **[Central Coast Transport, INC](https://ctcfinder.com/tester/central-coast-transport-inc-converse-tx/)** — 1823 FM 1516 N, Converse, TX 78109 — (210) 612-8056 — 22 mi. Services: OBD testing.
- **[GTC Services, LLC](https://ctcfinder.com/tester/gtc-services-llc-converse-tx/)** — 12930 Interstate 10 E, Converse, TX 78109 — (210) 648-0316 — 22 mi. Services: mobile testing, OBD testing.