---
title: "NS Tractor — Clean Truck Check, Willows, CA | CTC Finder"
description: "NS Tractor in Willows, CA 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/ns-tractor-willows/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# NS Tractor

Clean Truck Check tester in Willows, CA (Glenn 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 | Willows, CA 95988 |
| County | Glenn County |
| Phone | (530) 934-3382 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks NS Tractor 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 Regenald Michaud Aviation in Willows, about 1 mile away. [See listing](https://ctcfinder.com/tester/regenald-michaud-aviation-willows/).

## Clean Truck Check testers in Glenn County

NS Tractor is one of 6 testing businesses in Glenn County on CARB's public tester list. 5 of them offer mobile testing and 1 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 NS Tractor offer mobile Clean Truck Check testing?

Yes. NS Tractor 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 NS Tractor test a 2012 or older diesel truck?

NS Tractor does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Regenald Michaud Aviation](https://ctcfinder.com/tester/regenald-michaud-aviation-willows/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does NS Tractor charge for a Clean Truck Check?

NS Tractor has not published prices with us; call (530) 934-3382 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 NS Tractor a CARB-credentialed tester?

NS Tractor 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

- **[Regenald Michaud Aviation](https://ctcfinder.com/tester/regenald-michaud-aviation-willows/)** — Willows, CA 95988 — (530) 517-1495 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing.
- **[Beckham Fabrication and Repair](https://ctcfinder.com/tester/beckham-fabrication-and-repair-orland/)** — 7559 State Highway 32, Orland, CA 95963 — (530) 433-4441 — 17 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Mikes Mobile Diesel Smog Check](https://ctcfinder.com/tester/mikes-mobile-diesel-smog-check-orland/)** — 6721 County Road 20, Orland, CA 95963 — (530) 519-5670 — 17 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Ryan Karr](https://ctcfinder.com/tester/ryan-karr-orland/)** — Orland, CA 95963 — (530) 521-1202 — 17 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[William Irvin](https://ctcfinder.com/tester/william-irvin-orland/)** — Orland, CA 95963 — (530) 624-0148 — 17 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[North State Emissions Testing](https://ctcfinder.com/tester/north-state-emissions-testing-colusa/)** — 3145 Wilson Ave, Colusa, CA 95932 — (530) 501-0865 — 23 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.