10 Best Catalyst Cleaner of 2025

Tested and Reviewed: Top 10 Catalyst Cleaner deals with expert ratings from 8.1 to a perfect 10

April 2026 Edition

Editor's Choice

9.7

Save 26%

Liqui Moly

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

26% Off

Editor's bottom line:

“This catalyst cleaner 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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Picked by 397 people today

9.5

Save 11%

Cataclean

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

11% Off

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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9.5

Save 9%

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)

9% Off

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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9.2

Vizela

Catalytic Converter Cleaner Auto Parts Engine, Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil, Fuel System Treatment Oil Additive for Gas and Diesel Car(120 ml) (2pcs)

Main Highlights

Catalytic Converter CleanerSimply pour in your fuel tank.Makes engines start easily and run smoothly. Clean and protect catalytic converter material, increased fuel efficiency and reduced emissions
Catalytic Converter Cleaner kitReduces 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 & Easy to UseSimply pour this boost up catalytic convertor cleaner into your fuel tankno disassembly or professional help required for a thorough clean
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
Reduces Costly MaintenancePrevent expensive repairs by keeping your catalytic converter and exhaust system clean, extending their lifespan

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9.0

Save 10%

satasiam

2PCS Catalytic Converter Cleaner Kit,Auto Parts Engine Cleaner,Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil,Fuel System Treatment Oil for Gas and Diesel Car,120ML

10% Off

Main Highlights

DEEP-CLEANING POWER FOR YOUR EXHAUST SYSTEM: Our catalytic converter cleaner effectively removes stubborn carbon deposits, restoring optimal exhaust flow and engine performance
SAFE & EASY TO USE:Simply pour this boost up catalytic convertor cleaner into your fuel tankno disassembly or professional help required for a thorough clean
IMPROVES FUEL EFFICIENCY INSTANTLY:By clearing carbon buildup, this car cleaner helps boost up your MPG, saving you money at the pump with every use
REDUCES COSTLY MAINTENANCE:Prevent expensive repairs by keeping your catalytic converter and exhaust system clean, extending their lifespan
FAST-ACTING FORMULA FOR QUICK RESULTSNotice smoother acceleration and reduced emissions after 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)

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8.8

BlueDevil Products

BlueDevil 70523 Complete Catalytic & Emissions Cleaner - 16 Ounce

Main Highlights

Reduces Emissions: Improves fuel economy & increases response timing at startup and during acceleration.
Safe For Systems: Fuel Injected (Direct & Port), Direct Injection, Turbo Engines, EcoTech & EcoBoost, All Gasoline Engines, Hybrid Vehicles
Clears Common Engine Codes: P0420 & other related codes
Attacks Carbon Deposits: Removes harmful built up carbon from fuel system components.
Supports Catalytic Performance: Full system formulation cleaning supports healthy catalytic function and optimal engine performance.
Renews, Restores, & Cleans Fuel Systems: Targets fuel injectors, intake valves, combustion chambers, & the entire emissions system to increase power & 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

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

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

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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8.1

Save 10%

DURA LUBE

Dura Lube Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive, 16 fl. oz., (PN: HL-402409 PDQ3)

10% Off

Main Highlights

PERFORMANCE. Add to your vehicle anytime to help fuel systems and engine performance.
RECOMMENDATION. Use before replacing catalytic converter.
SHIELD. Protects catalytic system from harmful oil and maintains catalytic efficiency.
REDUCTION. Reduces phosphorus and zinc retention levels at catalyst inlet.
SAVING. Help increase fuel economy, fit type: universal fit work on all engines.

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8.1

MotorPower Care

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

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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Our Best Overall Choice

Best Choice

9.7

Liqui Moly

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

26% Off

Editor's bottom line:

“This 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.

Show Price

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