---
title: "Lomeli’s Diagnostics — Clean Truck Check, Merced, CA"
description: "Lomeli’s Diagnostics in Merced, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing. Phone…"
url: "https://ctcfinder.com/tester/lomelis-diagnostics-merced/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Lomeli’s Diagnostics

Clean Truck Check tester in Merced, CA (Merced 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 | 3568 Tammy Ct, Merced, CA 95348 |
| County | Merced County |
| Phone | (209) 354-6680 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Lomeli’s Diagnostics 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 | Not listed |

## Clean Truck Check testers in Merced County

Lomeli’s Diagnostics is one of 40 testing businesses in Merced County on CARB's public tester list. 35 of them offer mobile testing and 12 do smoke opacity tests. In Merced itself there are 13 listed businesses, 12 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 Lomeli’s Diagnostics offer mobile Clean Truck Check testing?

Yes. Lomeli’s Diagnostics 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 Lomeli’s Diagnostics test a 2012 or older diesel truck?

Yes. Lomeli’s Diagnostics 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 Lomeli’s Diagnostics charge for a Clean Truck Check?

Lomeli’s Diagnostics has not published prices with us; call (209) 354-6680 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 Lomeli’s Diagnostics a CARB-credentialed tester?

Lomeli’s Diagnostics 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

- **[Elmer Araujo](https://ctcfinder.com/tester/elmer-araujo-merced/)** — Merced, CA 95348 — (209) 230-3926 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing.
- **[MG Truck and Trailer](https://ctcfinder.com/tester/mg-truck-and-trailer-merced/)** — 646 Andrea Dr, Merced, CA 95348 — (209) 752-1084 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[San Joaquin Mobile Truck Check](https://ctcfinder.com/tester/san-joaquin-mobile-truck-check-merced/)** — 2752 Beachwood Dr, Merced, CA 95348 — (209) 261-3416 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Dan's CTC](https://ctcfinder.com/tester/dans-ctc-winton/)** — 6760 California St, Winton, CA 95388 — (209) 564-1633 — 5 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Taylor's](https://ctcfinder.com/tester/taylors-winton/)** — 6171 N Winton Way, Winton, CA 95388 — (209) 261-1048 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Jnava Mobile Opacity Inspections](https://ctcfinder.com/tester/jnava-mobile-opacity-inspections-merced/)** — 35 W Main St, Merced, CA 95340 — (209) 226-2566 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.