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New Rislone CAT Complete Turns Off ‘Check Engine’ Lights

The unique chemical formula cleans the entire emissions and exhaust system to clear the P0420 and other OBD codes.


When a customer wants to clear a “Check Engine” light without a potentially costly trip to the shop, Rislone’s new CAT Complete Fuel, Exhaust and Emissions System Cleaner could be the solution. 

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The unique chemical formula cleans the entire emissions and exhaust system to clear the P0420 and other OBD codes that indicate catalytic-converter efficiency issues, and then goes a step further to also clean the fuel system to increase power, performance and fuel economy, according to the company.

Generally, a vehicle’s “Check Engine” light (also known as the “Service Engine” light) illuminates when the vehicle’s computer detects a problem that affects emissions or drivetrain issues. Driving with the light on can cause increased vehicle emissions, poor fuel economy, reduced power, engine damage and vehicle breakdown. 

Rislone’s CAT Complete Fuel, Exhaust and Emissions System Cleaner (P/N 4720) is formulated with advanced high-performing detergents and heavy-duty cleaning solvents that effectively scrub and remove contaminants, soot, carbon build-up and oily residue from the fuel injectors, combustion chambers, turbo, catalytic converters, oxygen sensors and the exhaust. Other active chemical ingredients react with the gases created in the combustion process to remove the remaining inorganic deposits. This restores their function and, with regular use, maintains efficiency.  

“It’s never a good idea to ignore the ‘Check Engine’ light, but many people will drive for a long time with the light on because they fear the worst or can’t afford a mechanical repair,” says Clay Parks, vice president of development for Rislone.“You can put their minds at ease and save them some money by recommending Rislone CAT CompleteFuel, Exhaust and Emissions System Cleaner to help resolve emissions and exhaust system issues and clear the ‘Check Engine’ light.”


CAT Complete can be used as a pre-treatment before emissions tests or as an alternative to replacing catalytic converters. It’s also effective after failed smog tests, restores lost performance and reduces tailpipe, HC, CO and NOx emissions, according to the company. Regular use every 5,000 miles “tunes up” the fuel, emissions and exhaust system to keep it clean and prevent the “Check Engine” light from returning. 

Rislone is offering consumers a money-back guarantee. Visit for details on product refunds and requirements.

Rislone CAT Complete will not void manufacturers’ new-vehicle warranties, according to the company. It is specifically designed for vehicles with oxygen sensors and catalytic converters, and it exceeds EPA-compliance performance criteria, according to Rislone. It’s safe to use with gasoline, ethanol and hybrid vehicles.


Rislone CAT Complete works on fuel-injected, direct-injected, carbureted, turbo, GTDI, Ecotec and EcoBoost gasoline engines. Installation is easy and the bottle is designed to work in all gas tanks, including standard, obstructed and capless (no fuel cap) systems. 

All Rislone products are proudly made in the United States. Based in Holly, Michigan, Rislone has been America’s best-selling engine treatment brand for 100 years. Rislone is ISO 9001 certified.

To get a full list of codes Rislone CAT Complete will clear and more information about the product, visit Follow Rislone on Facebook at, on Twitter at, on YouTube at and through the blog at

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