---
title: "Sam Smog — Clean Truck Check, El Monte, CA | CTC Finder"
description: "Sam Smog in El Monte, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/sam-smog-el-monte/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Sam Smog

Clean Truck Check tester in El Monte, 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 | 11027 lower azusa rd d, El Monte, CA 91731 |
| County | Los Angeles County |
| Phone | (626) 377-6252 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Sam 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 | 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 SpeedTrucking Inc in El Monte, about 1 mile away. [See listing](https://ctcfinder.com/tester/speedtrucking-inc-el-monte/).

## Clean Truck Check testers in Los Angeles County

Sam 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 El Monte itself there are 11 listed businesses, 7 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 Sam Smog offer mobile Clean Truck Check testing?

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

Sam Smog does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [SpeedTrucking Inc](https://ctcfinder.com/tester/speedtrucking-inc-el-monte/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Sam Smog charge for a Clean Truck Check?

Sam Smog has not published prices with us; call (626) 377-6252 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 Sam Smog a CARB-credentialed tester?

Sam 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

- **[Byron Marroquin](https://ctcfinder.com/tester/byron-marroquin-el-monte/)** — El Monte, CA 91731 — (626) 378-0342 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Jason Diesel Quick Test](https://ctcfinder.com/tester/jason-diesel-quick-test-el-monte/)** — El Monte, CA 91731 — (626) 780-9519 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Manzur Test Only](https://ctcfinder.com/tester/manzur-test-only-el-monte/)** — 11240 Lower Azusa Rd, El Monte, CA 91731 — (626) 450-5129 — 1 mi. Services: OBD testing, motorhome testing.
- **[SpeedTrucking Inc](https://ctcfinder.com/tester/speedtrucking-inc-el-monte/)** — 3641 Rockwell Avenue, El Monte, CA 91731 — (626) 852-3356 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing.
- **[Alex Yu](https://ctcfinder.com/tester/alex-yu-el-monte/)** — El Monte, CA 91732 — (562) 307-4661 — 2 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Arturo Basurto](https://ctcfinder.com/tester/arturo-basurto-el-monte/)** — El Monte, CA 91732 — (626) 274-1065 — 2 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.