---
title: "Duncan and Son Lines — Clean Truck Check, Buckeye, AZ"
description: "Duncan and Son Lines in Buckeye, AZ is on CARB's Clean Truck Check tester list. Offers OBD testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/duncan-and-son-lines-buckeye-az/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Duncan and Son Lines

Clean Truck Check tester in Buckeye, AZ.

> 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 | 23860 W US Highway 85, Buckeye, AZ 85326 |
| Phone | (602) 904-1110 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Duncan and Son Lines 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 Xavier Villabol in Phoenix, about 33 miles away. [See listing](https://ctcfinder.com/tester/xavier-villabol-phoenix-az/).

If you need a tester at your yard, the nearest listed tester that offers mobile testing is GEO Mobile Fleet Service in Goodyear, about 14 miles away. [See listing](https://ctcfinder.com/tester/geo-mobile-fleet-service-goodyear-az/).

## Clean Truck Check testers in Arizona

Duncan and Son Lines is one of 43 testing businesses in Arizona on CARB's public tester list. 36 of them offer mobile testing and 9 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 Duncan and Son Lines 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 [GEO Mobile Fleet Service](https://ctcfinder.com/tester/geo-mobile-fleet-service-goodyear-az/) (about 14 miles).

### Can Duncan and Son Lines test a 2012 or older diesel truck?

Duncan and Son Lines does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Xavier Villabol](https://ctcfinder.com/tester/xavier-villabol-phoenix-az/) (about 33 miles). Trucks from 2013 on get an OBD scan instead.

### How much does Duncan and Son Lines charge for a Clean Truck Check?

Duncan and Son Lines has not published prices with us; call (602) 904-1110 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 Duncan and Son Lines a CARB-credentialed tester?

Duncan and Son Lines 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

- **[GEO Mobile Fleet Service](https://ctcfinder.com/tester/geo-mobile-fleet-service-goodyear-az/)** — 18433 W Cocopah St, Goodyear, AZ 85338 — (719) 347-5192 — 14 mi. Services: mobile testing, OBD testing.
- **[Hayden Kinana](https://ctcfinder.com/tester/hayden-kinana-goodyear-az/)** — Goodyear, AZ 85338 — (619) 948-1013 — 14 mi. Services: mobile testing, OBD testing.
- **[Milestone Diesel Repair LLC](https://ctcfinder.com/tester/milestone-diesel-repair-llc-goodyear-az/)** — 14428 W Desert Flower Dr, Goodyear, AZ 85395 — (480) 620-3393 — 20 mi. Services: mobile testing, OBD testing.
- **[Velocity Truck Center - Freightliner Dealership](https://ctcfinder.com/tester/velocity-truck-center-freightliner-dealership-tolleson-az/)** — 9899 West Roosevelt Street, Tolleson, AZ 85353 — (623) 907-9900 — 22 mi. Services: mobile testing, OBD testing, motorhome testing.