---
title: "Diesel Tech — Clean Truck Check, El Cajon, CA | CTC Finder"
description: "Diesel Tech in El Cajon, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby…"
url: "https://ctcfinder.com/tester/diesel-tech-el-cajon/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Diesel Tech

Clean Truck Check tester in El Cajon, CA (San Diego 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 | 1175 Avocado Avenue, El Cajon, CA 92021 |
| County | San Diego County |
| Phone | (619) 478-0955 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Diesel Tech 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 American Pride Diesel LLC in El Cajon, about 1 mile away. [See listing](https://ctcfinder.com/tester/american-pride-diesel-llc-el-cajon/).

## Clean Truck Check testers in San Diego County

Diesel Tech is one of 178 testing businesses in San Diego County on CARB's public tester list. 157 of them offer mobile testing and 91 do smoke opacity tests. In El Cajon itself there are 24 listed businesses, 24 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 Diesel Tech offer mobile Clean Truck Check testing?

Yes. Diesel Tech 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 Diesel Tech test a 2012 or older diesel truck?

Diesel Tech does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [American Pride Diesel LLC](https://ctcfinder.com/tester/american-pride-diesel-llc-el-cajon/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Diesel Tech charge for a Clean Truck Check?

Diesel Tech has not published prices with us; call (619) 478-0955 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 Diesel Tech a CARB-credentialed tester?

Diesel Tech 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

- **[American Pride Diesel LLC](https://ctcfinder.com/tester/american-pride-diesel-llc-el-cajon/)** — 14315-A Olde Highway 80, El Cajon, CA 92021 — (619) 567-9010 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Atalie Acosta](https://ctcfinder.com/tester/atalie-acosta-el-cajon/)** — El Cajon, CA 92021 — (619) 399-8884 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Daniel Chiaramonte](https://ctcfinder.com/tester/daniel-chiaramonte-el-cajon/)** — El Cajon, CA 92021 — (619) 988-7563 — 1 mi. Services: mobile testing, OBD testing.
- **[Easy Mobile CARB Compliance Testing](https://ctcfinder.com/tester/easy-mobile-carb-compliance-testing-el-cajon/)** — El Cajon, CA 92021 — (619) 633-0458 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[El Cajon Tire Pros](https://ctcfinder.com/tester/el-cajon-tire-pros-el-cajon/)** — 1253 North 2nd Street, El Cajon, CA 92021 — (619) 823-0592 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[John Hufft](https://ctcfinder.com/tester/john-hufft-el-cajon/)** — El Cajon, CA 92021 — (619) 831-9694 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.