---
title: "Western Star Northwest — Clean Truck Check, Ridgefield, WA"
description: "Western Star Northwest in Ridgefield, WA is on CARB's Clean Truck Check tester list. Offers OBD testing, motorhome testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/western-star-northwest-ridgefield-wa/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Western Star Northwest

Clean Truck Check tester in Ridgefield, WA.

> 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 | Ridgefield, WA 98642 |
| Phone | (360) 887-7500 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Western Star Northwest 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 Diesel Emissions Service in Portland, about 14 miles away. [See listing](https://ctcfinder.com/tester/diesel-emissions-service-portland-or/).

If you need a tester at your yard, the nearest listed tester that offers mobile testing is Diesel Emissions Service in Portland, about 14 miles away. [See listing](https://ctcfinder.com/tester/diesel-emissions-service-portland-or/).

## Clean Truck Check testers in Washington

Western Star Northwest is one of 17 testing businesses in Washington on CARB's public tester list. 11 of them offer mobile testing and 2 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 Western Star Northwest 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 [Diesel Emissions Service](https://ctcfinder.com/tester/diesel-emissions-service-portland-or/) (about 14 miles).

### Can Western Star Northwest test a 2012 or older diesel truck?

Western Star Northwest does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Diesel Emissions Service](https://ctcfinder.com/tester/diesel-emissions-service-portland-or/) (about 14 miles). Trucks from 2013 on get an OBD scan instead.

### How much does Western Star Northwest charge for a Clean Truck Check?

Western Star Northwest has not published prices with us; call (360) 887-7500 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 Western Star Northwest a CARB-credentialed tester?

Western Star Northwest 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

- **[Harmer Steel Products](https://ctcfinder.com/tester/harmer-steel-products-portland-or/)** — Portland, OR 97231 — (503) 679-5265 — 10 mi. Services: not listed.
- **[Diesel Emissions Service](https://ctcfinder.com/tester/diesel-emissions-service-portland-or/)** — 9861 N Vancouver Way, Portland, OR 97217 — (971) 544-7282 — 14 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Stephen Ewald](https://ctcfinder.com/tester/stephen-ewald-portland-or/)** — Portland, OR 97217 — (360) 241-2293 — 14 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Andrew Royce](https://ctcfinder.com/tester/andrew-royce-portland-or/)** — Portland, OR 97211 — (503) 715-3013 — 15 mi. Services: mobile testing, OBD testing.
- **[Pape](https://ctcfinder.com/tester/pape-portland-or/)** — 550 NE Columbia Blvd, Portland, OR 97211 — (503) 953-0062 — 15 mi. Services: mobile testing, OBD testing.
- **[AIRLIMITS-Portland OR](https://ctcfinder.com/tester/airlimits-portland-or-portland-or/)** — Portland, OR 97229 — (800) 788-5241 — 18 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.