Best Emission Reducing Cleaners

1. BlueDevil Catalytic & Emission System Cleaner | Premium Gasoline Additive Reducing Emissions, Cleans & Restores | 16 oz. | Multi-Vehicle Gasoline Formula

BlueDevil Catalytic & Emission System Cleaner is a premium gasoline additive that reduces emissions and cleans your engine. It’s designed to improve fuel economy and boost performance.

This formula works with all gasoline engines, including turbo, hybrid, and direct injection systems. It clears common engine codes like P0420 and removes carbon buildup.

The cleaner restores fuel systems, supports catalytic function, and increases power. It targets fuel injectors, intake valves, and combustion chambers for optimal results.

2. Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas

Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner keeps your car running smoothly. It cleans the catalytic converter, reduces emissions, and saves gas.

Use it every 5,000 miles to prevent costly repairs. Works with all engines and fuels. Safe for your warranty.

3. MotorPower Care Catalytic Converter Cleaner 2-Pack — Pass Smog & Emissions Test, Fix P0420/P0430 Check Engine Light | O2 Sensor & EGR Cleaner | Fuel Additive, 8.45 fl oz Each

MotorPower Care Catalytic Converter Cleaner is a 2-pack solution to help your car pass smog and emissions tests. It fixes check engine lights like P0420 and P0430. This fuel additive also cleans O2 sensors and EGR systems.

It restores engine performance for gasoline and hybrid vehicles. Each bottle contains 8.45 fl oz of powerful cleaner. Use it to keep your car running smoothly.

Note: This product cleans but does not repair cracked, broken, or melted catalytic converters. Ensure your converter is intact before use.

4. Rislone 4784 DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz

Rislone 4784 DEF Crystal Clean keeps your diesel vehicle’s SCR system free from crystallization build-up. It’s perfect for cars driven at slow speeds or making frequent stops. Use it every 5,000 miles for best results.

This cleaner works with all major diesel systems and is safe for new vehicles. It won’t void your manufacturer’s warranty. Just add it to your DEF tank (blue cap).

Regular use prevents white crystallization from returning. It’s easy to use and keeps your diesel running smoothly. Trust DEF Crystal Clean for a cleaner, more efficient ride.

5. Rislone® 4744 DPF CLEAN™ Diesel DPF, Exhaust & Emissions System Cleaner, 16.9 oz, 1-Pack

Rislone® 4744 DPF CLEAN™ is a powerful cleaner for diesel engines. It boosts power, performance, and mileage while saving fuel.

This product cleans the entire emissions, exhaust, and fuel system. Regular use prevents issues like excessive exhaust regeneration and the CEL light.

Safe for all diesel types, works with DOC, DPF, SCR, and DEF systems, lowers ignition temperature to burn soot.

6. MotorPower Care Catalytic Converter Cleaner — Pass Emissions Test & Fix P0420 | Cleans O2 Sensor, EGR Valve & Exhaust System | Fuel Additive for Gas & Hybrid Engines, 8.45 fl oz

MotorPower Care Catalytic Converter Cleaner helps you pass emissions tests and fix engine codes. It cleans your entire exhaust system while you drive. Save money and avoid costly repairs with this easy-to-use solution.

Proven results show it reduces harmful emissions significantly. It dissolves carbon deposits and clears common fault codes like P0420 and P0430.

Works in just 40 minutes—pour, drive, and let it clean. Safe for all gas and hybrid engines. Use every 3,000 miles to prevent expensive replacements.

7. Molecure CR12 Catalytic Restore Emission Treatment 12 oz – Catalytic Converter Cleaner & O2 Sensor Fuel Additive | Reduces Carbon Buildup & Hydrocarbon Emissions | Treats Up to 20 Gal of Gasoline

Molecure CR12 is a powerful fuel additive that cleans your car’s catalytic converter and oxygen sensors. It reduces carbon buildup and cuts harmful emissions.

This treatment helps fix engine codes like P0420 and P0430. It restores throttle response and improves fuel economy. Use it before emissions tests for better results.

Safe for all gasoline engines, it works with turbocharged and hybrid systems. One 12 oz bottle treats up to 20 gallons of gas. Add it to your tank every 3,000 miles for ongoing maintenance.

8. BlueDevil Catalytic & Emission System Cleaner | Premium Gasoline Additive Reducing Emissions, Cleans & Restores | 16 oz. | Pack of 6 | Multi-Vehicle Gasoline Formula

BlueDevil Catalytic & Emission System Cleaner is a premium gasoline additive designed to reduce emissions and improve fuel economy. It works for all gasoline engines, including turbo and hybrid vehicles. This multi-vehicle formula is safe and effective.

It clears common engine codes like P0420 and attacks carbon deposits in your fuel system. By removing harmful buildup, it restores and cleans vital components. This keeps your catalytic converter and engine running smoothly.

The 16 oz. pack of 6 is easy to use and supports full system cleaning. It renews fuel systems, boosts power, and enhances performance. BlueDevil ensures your vehicle stays efficient and reliable.

9. Rislone 4784-6PK DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz (Pack of 6)

Rislone 4784-6PK DEF Crystal Clean keeps your diesel’s SCR system free from crystallization build-up. It’s perfect for vehicles driven at slow speeds or making frequent stops. Use it every 5,000 miles for best results.

This cleaner works with all major diesel systems and DEF fluids. It’s safe for new vehicles and won’t void your warranty. Just add it to your blue-cap DEF tank.

Regular use prevents white crystallization from returning. It’s easy to use and keeps your diesel running smoothly. Trust DEF Crystal Clean for a cleaner, efficient system.

10. EZ PASS™ Emissions Treatment | Catalytic Converter & O2 Sensor Cleaner | Emissions System Support | Smog Test Prep | 16 Fl oz

EZ PASS™ Emissions Treatment is a one-step solution for your car’s emissions system. Just pour one bottle into a full tank of gas. It cleans key parts like the catalytic converter and oxygen sensors.

This treatment supports smog test prep and reduces carbon buildup. It helps your car run smoother and pass emissions tests. Use it before inspections for better results.

Each bottle treats up to 16 gallons of gas. Drive at highway speed after adding it. Use every 2,000 miles to keep your engine efficient and clean.