---
title: "Robinson Enterprises — Clean Truck Check, Nevada City, CA"
description: "Robinson Enterprises in Nevada City, CA is on CARB's Clean Truck Check tester list with 2 credentialed testers. Offers OBD testing, smoke opacity (non-OBD)…"
url: "https://ctcfinder.com/tester/robinson-enterprises-nevada-city/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Robinson Enterprises

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 | 293 Lower Grass Valley Rd, Nevada City, CA 95959 |
| County | Nevada County |
| Phone | (530) 559-7335 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 2 |
| Last verified | 2026-11-01 |

## Which trucks Robinson Enterprises 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 |

If you need a tester at your yard, the nearest listed tester that offers mobile testing is Sierra Diesel Mobile Smog in Nevada City, about 1 mile away. [See listing](https://ctcfinder.com/tester/sierra-diesel-mobile-smog-nevada-city/).

## Clean Truck Check testers in Nevada County

Robinson Enterprises 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 Robinson Enterprises 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 [Sierra Diesel Mobile Smog](https://ctcfinder.com/tester/sierra-diesel-mobile-smog-nevada-city/) (about 1 mile).

### Can Robinson Enterprises test a 2012 or older diesel truck?

Yes. Robinson Enterprises 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 Robinson Enterprises charge for a Clean Truck Check?

Robinson Enterprises has not published prices with us; call (530) 559-7335 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 Robinson Enterprises a CARB-credentialed tester?

Robinson Enterprises appears on CARB's public Clean Truck Check tester list with 2 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

- **[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.
- **[Sierra Diesel Mobile Smog](https://ctcfinder.com/tester/sierra-diesel-mobile-smog-nevada-city/)** — 16396 Jacks Rd, Nevada City, CA 95959 — (530) 920-0092 — 1 mi. Services: mobile testing, 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.