---
title: "Darling Smog — Clean Truck Check, Glendora, CA | CTC Finder"
description: "Darling Smog in Glendora, CA is on CARB's Clean Truck Check tester list with 2 credentialed testers. Offers mobile testing, OBD testing, smoke opacity…"
url: "https://ctcfinder.com/tester/darling-smog-glendora/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Darling Smog

Clean Truck Check tester in Glendora, CA (Los Angeles 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 | 743 W Route 66 #4, Glendora, CA 91740 |
| County | Los Angeles County |
| Phone | (626) 495-8835 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 2 |
| Last verified | 2026-11-01 |

## Which trucks Darling 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 Los Angeles County

Darling Smog is one of 516 testing businesses in Los Angeles County on CARB's public tester list. 465 of them offer mobile testing and 190 do smoke opacity tests. In Glendora itself there are 5 listed businesses, 5 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 Darling Smog offer mobile Clean Truck Check testing?

Yes. Darling 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 Darling Smog test a 2012 or older diesel truck?

Yes. Darling 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 Darling Smog charge for a Clean Truck Check?

Darling Smog has not published prices with us; call (626) 495-8835 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 Darling Smog a CARB-credentialed tester?

Darling Smog 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

- **[188844motor.com](https://ctcfinder.com/tester/188844motor-com-glendora/)** — 512 W Route 66, Glendora, CA 91740 — (951) 258-7309 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Motor](https://ctcfinder.com/tester/motor-glendora/)** — 512 West Route 66, Glendora, CA 91740 — (626) 551-9057 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Ricardo Lopez](https://ctcfinder.com/tester/ricardo-lopez-glendora/)** — Glendora, CA 91740 — (909) 764-1991 — 1 mi. Services: mobile testing, OBD testing.
- **[Route 66 Smog of Glendora](https://ctcfinder.com/tester/route-66-smog-of-glendora-glendora/)** — 200 East Route 66, Glendora, CA 91740 — (626) 335-2126 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Caloha Air Compliance](https://ctcfinder.com/tester/caloha-air-compliance-san-dimas/)** — 207 Hollyglen Lane, San Dimas, CA 91773 — (626) 926-1825 — 3 mi. Services: mobile testing, OBD testing.
- **[DieselWorx](https://ctcfinder.com/tester/dieselworx-san-dimas/)** — San Dimas, CA 91773 — (626) 633-6967 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.