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Walker Creates Resources For New Colorado Emissions Regs

New CARB-compliant regulations went into effect January 1.


Walker Emissions Control, a leading global brand from Tenneco’s DRiV group, has published new training materials, including an educational video and other instructional resources, to help customers and consumers navigate new emissions regulations in Colorado.  


Effective Jan. 1, 2021, the state of Colorado has instituted a new law that impacts the sale and installation of aftermarket catalytic converters, adopted from the California Air Resources Board (CARB) standard. The new regulation applies to all catalytic converter repairs, regardless of the vehicle’s OEM emissions certification.

Under these new standards, all aftermarket catalytic converters sold or installed in Colorado are now required to meet CARB emissions compliance standards, last for five years/50,000 miles, and have a warranty for that same duration that covers the cost of parts and labor should a replacement be necessary. Additionally, aftermarket converters for newer vehicles must be compatible with OBD II catalyst monitors to prevent false catalyst fault codes and provide a correct fault code upon converter failure.  

To make things easier for customers, Walker has updated its website eCatalog specific to these new requirements so the correct part number necessary to complete a repair can be easily identified by selecting the state the vehicle is registered in. Backed by its engineering team who sets the standard by consistently meeting CARB requirements with zero rescinded executive orders*, Walker CalCat converters feature catalytic technology that provides the proper material and design, including the right loading of precious metals paired with a precise OE-style substrate coating process and a high-technology washcoat for assured performance, to meet CARB emissions standards. CARB-compliant products are also embossed with labeling requirements displayed on the shell of each catalytic converter including the California executive order numbers, the manufacturing date, Walker part number, and exhaust flow indicator. 


“We understand how these new regulations can be confusing, especially when it comes to installing the correct, CARB-compliant products on a vehicle,” said Audrey Lang, senior product manager, Walker. “To make things easier for our customers, we have created robust online resources to assist technicians and consumers to find the correct part quickly. Our catalog specifically indicates which converters are legal for use in Colorado and on which vehicles they can be installed.”

Visit the Walker website at to learn more about CARB-compliant products and about these new regulations in Colorado.  


* As of January 2020