---
title: "Sierra Diesel Mobile Smog — Clean Truck Check, Nevada City, CA"
description: "Sierra Diesel Mobile Smog in Nevada City, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing…"
url: "https://ctcfinder.com/tester/sierra-diesel-mobile-smog-nevada-city/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Sierra Diesel Mobile Smog

Clean Truck Check tester in Nevada City, CA (Nevada 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 | 16396 Jacks Rd, Nevada City, CA 95959 |
| County | Nevada County |
| Phone | (530) 920-0092 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Sierra Diesel Mobile Smog 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 Nevada County

Sierra Diesel Mobile Smog is one of 8 testing businesses in Nevada County on CARB's public tester list. 5 of them offer mobile testing and 5 do smoke opacity tests. In Nevada City itself there are 3 listed businesses, 1 of them mobile.

## 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 Sierra Diesel Mobile Smog offer mobile Clean Truck Check testing?

Yes. Sierra Diesel Mobile Smog 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 Sierra Diesel Mobile Smog test a 2012 or older diesel truck?

Yes. Sierra Diesel Mobile Smog 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 Sierra Diesel Mobile Smog charge for a Clean Truck Check?

Sierra Diesel Mobile Smog has not published prices with us; call (530) 920-0092 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 Sierra Diesel Mobile Smog a CARB-credentialed tester?

Sierra Diesel Mobile Smog 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

- **[Brian Forkner](https://ctcfinder.com/tester/brian-forkner-nevada-city/)** — Nevada City, CA 95959 — (530) 470-3881 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Robinson Enterprises](https://ctcfinder.com/tester/robinson-enterprises-nevada-city/)** — 293 Lower Grass Valley Rd, Nevada City, CA 95959 — (530) 559-7335 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Mobile Truck Service](https://ctcfinder.com/tester/mobile-truck-service-alta/)** — 565 Kearsarge Ct, Alta, CA 95701 — (916) 389-0312 — 10 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Cody's Clean Truck Check](https://ctcfinder.com/tester/codys-clean-truck-check-grass-valley/)** — 780 Whispering Pines Ln, Grass Valley, CA 95945 — (530) 277-5833 — 12 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Palmer Enterprises Truck & Auto Repair LLC](https://ctcfinder.com/tester/palmer-enterprises-truck-and-auto-repair-llc-grass-valley/)** — 11352 E Bennett Rd, Grass Valley, CA 95945 — (530) 272-3439 — 12 mi. Services: OBD testing.
- **[JTS truck and equipment repair inc](https://ctcfinder.com/tester/jts-truck-and-equipment-repair-inc-rough-and-ready/)** — 17268 Cattle Dr, Rough and Ready, CA 95975 — (530) 615-1219 — 18 mi. Services: mobile testing, OBD testing, motorhome testing.