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

Diagnostic Capabilities


If you are interested in further information about any of the Smoke Opacity Testing Services that CDS Inland Empire provides, please contact us today at (909) 554-3479 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.

We offer aftermarket OE replacement gaskets, clamps and bungs.

Have a light duty truck with an OE DPF system? We offer service kits to turn your non-serviceable filter into a removable DPF capable of multiple cleanings.

CDS DPF Service Kits

We offer aftermarket OE replacement gaskets, clamps and bungs.

Have a light duty truck with an OE DPF system? We offer service kits to turn your non-serviceable filter into a removable DPF capable of multiple cleanings.

CDS DPF Service Kits