Opacity   Testing

If you own two or more vehicles with a GVW of 6,000 lbs or more C.A.R.B. requires you to comply with California’s Periodic Smoke Inspection Program. Our technicians and equipment are certified according to the SAE J1667 specifications to perform state opacity tests on fleets of any size.

What are the allowable levels of smoke opacity?

All 1991 or newer engines must not exceed 40% smoke opacity.

Recordkeeping Requirements

CARB requires the two most recent consecutive years records be retained as well as initial test, repair info, post-repair opacity test and meter calibration. CDS retains all testing information for you at no extra cost.
ARB Site for Opacity Tests

Regulated By California Air Resources Board


Applicability Heavy-duty diesel-powered vehicles 14,000 lbs. GVWR or greater 
6,000 lbs. GVWR or greater for 1998 and older.


Annually (on or before December 31 of each year)

Diagnostic Capabilities

Because DPF filters capture all particulates they can mask serious engine malfunctions. Opacity testing your engine before the DPF can be an effective and inexpensive tool to catch engine failures before they cause damage to any engine or emission components.

If you are interested in further information about any of the Smoke Opacity Testing Services that CDS Escondido provides, please contact us today at (442) 999-4774‬ or email us HERE to learn more. We would be happy to arrange an absolutely free, no obligation estimate on the services and products we offer.