---
title: "Jan Cahill Jr — Clean Truck Check, Mountain Center, CA"
description: "Jan Cahill Jr in Mountain Center, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and…"
url: "https://ctcfinder.com/tester/jan-cahill-jr-mountain-center/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Jan Cahill Jr

Clean Truck Check tester in Mountain Center, CA (Riverside 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 | Mountain Center, CA 92561 |
| County | Riverside County |
| Phone | (760) 803-7424 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Jan Cahill Jr 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 PS Smog in Palm Springs, about 8 miles away. [See listing](https://ctcfinder.com/tester/ps-smog-palm-springs/).

## Clean Truck Check testers in Riverside County

Jan Cahill Jr is one of 251 testing businesses in Riverside County on CARB's public tester list. 233 of them offer mobile testing and 102 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 Jan Cahill Jr offer mobile Clean Truck Check testing?

Yes. Jan Cahill Jr 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 Jan Cahill Jr test a 2012 or older diesel truck?

Jan Cahill Jr does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [PS Smog](https://ctcfinder.com/tester/ps-smog-palm-springs/) (about 8 miles). Trucks from 2013 on get an OBD scan instead.

### How much does Jan Cahill Jr charge for a Clean Truck Check?

Jan Cahill Jr has not published prices with us; call (760) 803-7424 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 Jan Cahill Jr a CARB-credentialed tester?

Jan Cahill Jr 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

- **[PS Smog](https://ctcfinder.com/tester/ps-smog-palm-springs/)** — 4633 E Ramon Rd, Palm Springs, CA 92264 — (760) 778-7664 — 8 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Desert Smog](https://ctcfinder.com/tester/desert-smog-palm-desert/)** — 74725 Joni Dr Suite B, Palm Desert, CA 92260 — (760) 282-4056 — 11 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Ozone Smog](https://ctcfinder.com/tester/ozone-smog-palm-desert/)** — 74817 Joni Dr Ste F, Palm Desert, CA 92260 — (760) 341-4601 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Palm Desert Automotive](https://ctcfinder.com/tester/palm-desert-automotive-palm-desert/)** — 74817 Joni Dr Suite E, Palm Desert, CA 92260 — (760) 341-4685 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Crenshaw Clean Air Testing](https://ctcfinder.com/tester/crenshaw-clean-air-testing-cathedral-city/)** — 27405 Landau Blvd, Cathedral City, CA 92234 — (760) 960-3267 — 14 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Smogdoghd](https://ctcfinder.com/tester/smogdoghd-indian-wells/)** — 75440 Painted Desert Dr, Indian Wells, CA 92210 — (760) 574-0420 — 15 mi. Services: mobile testing, OBD testing, motorhome testing.