There is no time for downtime in the diesel industry

Why Choose Diesel Exhaust & Emissions (DEE) For Retrofit:

  • With over 50 years of experience, we have a thorough knowledge of CARB and EPA regulations and can explain them to you in simple language.

  • We are versatile.  DEE represents and installs all major verified devices. DEE retrofits with Best Available Control Technology (BACT).

  • We are known for our premium installations. Many companies advertise “quality” but DEE’s reputation is unparalleled and speaks for itself from our manufactured and custom fabricated designs.

  • We have verifications from fleet dealers who trust us to keep their trucks in compliance.

  • We are one of the few businesses around through the history of CARB/EPA regulations and are familiar with the newest requirements.

    For more information or a quote please contact us at:

Every diesel engine falls under one of the following regulations.  We will help you determine what guidelines you are under and how to bring the equipment into compliance:


Diesel Exhaust and Emissions (DEE) are pioneers in the diesel particulate filter industry and is a leading authority in emissions and regulations. 


DEE works with public and privately owned fleets as well as independently-owned and operated vehicles.  Ask customers why they come to DEE and these reasons typically rise to the top:

Reliability – We have stringent procedures in place along with a rigorous cleaning process including time stamp and documented results. We are consistently good at what we do. That’s good for you.

Mobility – Can’t come to us?  We’ll come to you.


OEM Diagnosis

We have the software and capabilities to plug in and test, diagnose and troubleshoot all OEM systems. Our software pulls up fault codes, and our trained and experienced technicians will accurately resolve any issues. Avoid long wait times and high costs at dealers.

Opacity & Clean Truck Check Testing

AVOID CARB PENALTIES & DMV VIN BLOCKS! Contact us to schedule your emissions test. 

Emissions inspections are required for all California-based fleets with diesel and Natural Gas vehicles over 14,000 GVRW. 

  • Our techs are CCDET and CARB certified.
  • All vehicles that do not pass the test must be repaired and retested.
  • We offer on-site and in-house emissions testing around your schedule with our state certified technicians. 
    Don’t be caught in a fog of smog. The professional certified team at DEE is available to you 7 days a week. 


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