---
title: "Diesel Emissions Service — Clean Truck Check, Portland, OR"
description: "Diesel Emissions Service in Portland, OR is on CARB's Clean Truck Check tester list with 3 credentialed testers. Offers mobile testing, OBD testing, smoke…"
url: "https://ctcfinder.com/tester/diesel-emissions-service-portland-or/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Diesel Emissions Service

Clean Truck Check tester in Portland, OR.

> 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 | 9861 N Vancouver Way, Portland, OR 97217 |
| Phone | (971) 544-7282 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 3 |
| Last verified | 2026-11-01 |

## Which trucks Diesel Emissions Service 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 | Yes |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

## Clean Truck Check testers in Oregon

Diesel Emissions Service is one of 25 testing businesses in Oregon on CARB's public tester list. 21 of them offer mobile testing and 6 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 Diesel Emissions Service offer mobile Clean Truck Check testing?

Yes. Diesel Emissions Service 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 Diesel Emissions Service test a 2012 or older diesel truck?

Yes. Diesel Emissions Service lists smoke opacity testing, the test CARB requires for diesel trucks of model year 2012 and older (no OBD). See [OBD vs smoke opacity](https://ctcfinder.com/guide/obd-vs-smoke-opacity-test/).

### How much does Diesel Emissions Service charge for a Clean Truck Check?

Diesel Emissions Service has not published prices with us; call (971) 544-7282 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 Diesel Emissions Service a CARB-credentialed tester?

Diesel Emissions Service appears on CARB's public Clean Truck Check tester list with 3 credentialed testers, 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

- **[Stephen Ewald](https://ctcfinder.com/tester/stephen-ewald-portland-or/)** — Portland, OR 97217 — (360) 241-2293 — 1 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 — 3 mi. Services: mobile testing, OBD testing.
- **[Pape](https://ctcfinder.com/tester/pape-portland-or/)** — 550 NE Columbia Blvd, Portland, OR 97211 — (503) 953-0062 — 3 mi. Services: mobile testing, OBD testing.
- **[AIRLIMITS-Portland OR](https://ctcfinder.com/tester/airlimits-portland-or-portland-or/)** — Portland, OR 97229 — (800) 788-5241 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Harmer Steel Products](https://ctcfinder.com/tester/harmer-steel-products-portland-or/)** — Portland, OR 97231 — (503) 679-5265 — 9 mi. Services: not listed.
- **[Western Star Northwest](https://ctcfinder.com/tester/western-star-northwest-ridgefield-wa/)** — Ridgefield, WA 98642 — (360) 887-7500 — 14 mi. Services: OBD testing, motorhome testing.