10 Best Catalytic Converter Cleaners of 2025

Tested and Reviewed: Top 10 Catalytic Converter Cleaners deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

Liqui Moly

Liqui Moly Catalytic System Clean 300 ml 7110. Cleans The Injection System and The Combustion Chamber.

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Editor's bottom line:

“This catalytic converter cleaners is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Protects the catalytic converter from clogging with soot.
Cleans the injection system and the combustion chamber.
Improves the combustion of the fuel.
Clean engines reduce fuel consumption and therefore CO2 emissions.
Suitable for all gasoline engines with a catalytic converter.

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9.5

Cataclean

Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 16oz - Pack of 2 (120019)

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Main Highlights

Pass Emissions Tests with Confidence: Cataclean is specifically formulated to reduce carbon build-up and clean vital components like catalytic converters, DPF filters and oxygen sensors, helping your vehicle meet stringent smog and emissions standards. Reduces hydrocarbon emissions on gas motors by up to 50%!
Enhance Fuel Economy and Performance: Cataclean cleans fuel injectors and cylinder heads, leading to improved fuel combustion, better mileage, and restored engine power.
Clear Check Engine Lights: By cleaning your cars exhaust and fuel systems, Cataclean restores optimal performance and helps resolve common check engine light codes like P0420, P0430, P0171, P0174, P0300, and P0401, potentially saving you thousands on repairs.
Maintain Catalytic Converter Efficiency: Regular use of Cataclean helps prevent carbon accumulation in your catalytic converter, ensuring it operates efficiently and prolongs its lifespan.
Easy Application: Simply add Cataclean to your fuel tank as directed; no special tools or mechanical skills required, making it a convenient addition to your vehicle maintenance routine. Safe for use in gasoline, diesel and Hybrid engines. 50 state legal.

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9.5

Cataclean

Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 16oz (120007)

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Main Highlights

Using Cataclean can lower your total hydrocarbon emissions by up to 50 percent
Reduces carbon build-up in catalytic converter, oxygen sensors, fuel injectors and cylinder heads which results in improved fuel efficiency
Improves overall vehicle performance-including driveability issues such as power reduction, hesitation, rough idle, hard starts and lost fuel economy
Safe for gasoline, diesel, hybrid and flex-fuel vehicles; does not alter fuel
Not for use in 2-stroke or oil / gas mix engines

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9.2

MotorPower Care

2X Cans Catalytic Converter Cleaner, Oxygen sensor cleaner, pass emissions, SMOG, fuel additive, combustion chamber cleaner

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Main Highlights

Restores Engine Performance
Compatible with Gasoline & Hybrid Vehicles
Ensure the catalytic converter is intact. This product is highly effective for cleaning but will not repair a cracked, broken, or melted catalytic converter.

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9.0

DURA LUBE

DURA LUBE 2 Pack Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive, 16 fl. Oz, 2-Pack Combo Pack

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Main Highlights

PERFORMANCE. Add to your vehicle anytime to help fuel systems and engine performance.
USE BEFORE REPLACING CATALYTIC CONVERTER
SHIELD. Protects catalytic system from harmful oil poisons and maintains catalytic efficiency.
PROTECTS CATALYTIC SYSTEM FROM OIL POISONS AND MAINTAINS CATALYTIC EFFICIENCY
REDUCES PHOSPOHORUS AND ZINC RETENTION LEVELS AT CATALYST INLET
HELP INCREASE FUEL ECONOMY
FIT TYPE: UNIVERSAL FIT WORKS ON ALL ENGINES

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8.8

hepanio

hepanio 3Pcs Catalytic Converter Cleaner,Catalytic Converter Cleaner Kit,Auto Parts Engine,Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil,Fuel System Treatment Oil Additive

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Main Highlights

Catalytic CleanerReduces Carbon Build-Up In Catalytic Converter,Fuel Injectors And Cylinder Heads Which Results In Improved Fuel Efficiency. Improves Overall Vehicle Performance-Including Driveability Issues Such As Power Reduction, Hesitation, Rough Idle, Hard Starts And Lost Fuel Economy
Optimize Engine PerformanceThis Fuel System Cleaner Ensures Smooth Fuel And Exhaust Flow, Reducing Engine Roughness, Improving Overall Performance, And Lowering Long-Term Maintenance Costs
Safety To UseSafe For Gasoline, Diesel, Hybrid And Flex-Fuel Vehicles; Does Not Alter Fuel. Not For Use In 2-Stroke Or Oil/Gas Mix Engines. There Is No Need To Worry About Leakage Or Evaporation
Simplified Vehicle Maintenance Just Pour One Bottle Into Your Fuel Tank During Refueling - No Mechanics Required, Works With All Gasoline, Diesel, Hybrid And Flex-Fuel Vehicles (Including High-Mileage Engines Over 75,000 Miles)
Fuel System Cleaner--- Proper Fuel And Exhaust Flow Will Keep That Engine Start Easily And Run Smoothly, Which Will Also Cut Down On Maintenance Costs. Help Clean The Fuel Injection System, As Well As The Cylinders, Improving Overall Performance

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8.6

stray poet

stray poet 3Pcs Catalytic Converter Cleaner,Catalytic Converter Cleaner Kit,Auto Parts Engine,Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil,Fuel System Treatment Oil Additive

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Main Highlights

Catalytic CleanerReduces Carbon Build-Up In Catalytic Converter,Fuel Injectors And Cylinder Heads Which Results In Improved Fuel Efficiency. Improves Overall Vehicle Performance-Including Driveability Issues Such As Power Reduction, Hesitation, Rough Idle, Hard Starts And Lost Fuel Economy
Optimize Engine PerformanceThis Fuel System Cleaner Ensures Smooth Fuel And Exhaust Flow, Reducing Engine Roughness, Improving Overall Performance, And Lowering Long-Term Maintenance Costs
Simplified Vehicle Maintenance Just Pour One Bottle Into Your Fuel Tank During Refueling - No Mechanics Required, Works With All Gasoline, Diesel, Hybrid And Flex-Fuel Vehicles (Including High-Mileage Engines Over 75,000 Miles)
Safety To UseSafe For Gasoline, Diesel, Hybrid And Flex-Fuel Vehicles; Does Not Alter Fuel. Not For Use In 2-Stroke Or Oil/Gas Mix Engines. There Is No Need To Worry About Leakage Or Evaporation
Fuel System Cleaner--- Proper Fuel And Exhaust Flow Will Keep That Engine Start Easily And Run Smoothly, Which Will Also Cut Down On Maintenance Costs. Help Clean The Fuel Injection System, As Well As The Cylinders, Improving Overall Performance

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8.3

MotorPower Care

Catalytic Converter Cleaner Pass Emissions Test Cleans, Maintain Catalyst Efficiency Oxygen sensor and combustion chamber cleaner, Safe Fuel Additive

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Main Highlights

Advanced Cleaning Formula.
Helps restore lost horsepower and fuel efficiency.
Reduces the risk of engine damage.
Easy to use additive that can be directly added to the fuel tank during refueling.
Compatible with all gasoline and hybrid vehicles.
Oxygen Sensor Safe.

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8.1

Generic

3Pcs Catalytic Converter Cleaner Kit,Fuel System Treatment Oil Additive,Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil,Boost Up Catalytic Convertor Cleaner

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Main Highlights

Catalytic CleanerReduces Carbon Build-Up In Catalytic Converter,Fuel Injectors And Cylinder Heads Which Results In Improved Fuel Efficiency. Improves Overall Vehicle Performance-Including Driveability Issues Such As Power Reduction, Hesitation, Rough Idle, Hard Starts And Lost Fuel Economy
Optimize Engine PerformanceThis Fuel System Cleaner Ensures Smooth Fuel And Exhaust Flow, Reducing Engine Roughness, Improving Overall Performance, And Lowering Long-Term Maintenance Costs
Safety To UseSafe For Gasoline, Diesel, Hybrid And Flex-Fuel Vehicles; Does Not Alter Fuel. Not For Use In 2-Stroke Or Oil/Gas Mix Engines. There Is No Need To Worry About Leakage Or Evaporation
Simplified Vehicle Maintenance Just Pour One Bottle Into Your Fuel Tank During Refueling - No Mechanics Required, Works With All Gasoline, Diesel, Hybrid And Flex-Fuel Vehicles (Including High-Mileage Engines Over 75,000 Miles)
Fuel System Cleaner--- Proper Fuel And Exhaust Flow Will Keep That Engine Start Easily And Run Smoothly, Which Will Also Cut Down On Maintenance Costs. Help Clean The Fuel Injection System, As Well As The Cylinders, Improving Overall Performance

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8.1