10 Best catalytic converter cleaners of 2025

Save up to 22% off

Best Choice

1

Cataclean
Cataclean - (2) Bottle 16Oz. Fuel/Exhaust (120019)
Main highlights

EPA Approved and Safe
EPA approved cleaner that is safe for gasoline, diesel, and hybrid engines, ensuring no alteration in fuel composition.

Ideal for Performance Boost
Perfect for restoring catalytic converters, oxygen sensors, and fuel injectors, enhancing vehicle performance.

Highly Praised for Engine Light Fix
Frequently commended for reducing check engine light occurrences, saving on costly repairs.
9.6

Exceptional

Our Rating

9.1
Simple to use

8.0
worth the money

8.0
distance
How do we rank?

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Based on millions of stores and reviews

Shoppers influence our rankings
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Value for Money

2

Mr. Gasket
Cataclean (120007-2PK) Fuel and Exhaust System Cleaner - 16 fl. oz., (Pack of 2)
Main highlights

Emission Reduction Benefit
Using Cataclean can lower your total hydrocarbon emissions by up to 50 percent, improving environmental impact.

Versatile Vehicle Use
Safe for gasoline, diesel, hybrid, and flex-fuel vehicles, enhancing compatibility.

Customer Praise for Performance
Customers frequently highlight improved vehicle performance and drivability after use.
9.5

Excellent

Our Rating

9.7
Simple to use

8.0
worth the money

8.0
distance
3

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

18% Off
Main highlights

Catalytic Converter Protection
Prevents clogging with soot, ensuring optimal converter performance.

Ideal for Gasoline Engines
Best suited for all gasoline engines with catalytic converters.

Enhanced Fuel Combustion
Commonly praised for improving fuel combustion and efficiency.
9.3

Excellent

Our Rating
4

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

Easy_Use_No_Disassembly
Clean and protect catalytic converter material without disassembly, easy to use.

Ideal_For_Fault_Codes
Fixes P0420 & P0430 codes if the catalyst is not broken.

Customer_Praise_For_Effectiveness
Highly effective in improving gas mileage and clearing engine codes.
9.2

Excellent

Our Rating
5

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

Performance and Economy Booster
Enhances fuel systems, improves engine performance, and increases fuel economy.

Ideal for Catalytic System Protection
Best used before replacing catalytic converters to maintain efficiency.

Customer Praised Emission Reduction
Notably reduces emissions, aiding in passing smog tests.
9.1

Excellent

Our Rating

9.9
Simple to use

8.0
worth the money

8.0
distance
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6

DURA LUBE
Dura Lube Severe Catalytic and Exhaust Treatment | 16 oz., 2-Pack

11% Off
Main highlights

Boosts Engine Performance
Enhances fuel systems and engine performance, improving fuel economy and catalytic efficiency.

Ideal for Pre-Replacement Use
Use before replacing catalytic converter to potentially avoid costly repairs.

Highly Effective Cleaner
Customers praise its ability to clear codes and improve exhaust system function.
9.0

Excellent

Our Rating
7

MotorPower Care
Catalytic Converter Cleaner Pass Emissions Test Cleans Catalyst, Oxygen sensor and combustion chamber cleaner, fuel additive
Main highlights

Improves Performance and Efficiency
Effectively cleans catalytic converters, restoring horsepower and fuel efficiency.

Ideal for Emission Test Preparations
Perfect for vehicles struggling to pass smog checks.

Engine Light Code Clearing
Commonly praised for clearing engine light codes related to catalytic efficiency.
8.9

Very Good

Our Rating

8.0
worth the money

8.0
distance
8

Engine Wizard

Engine Wizard - Catalytic Converter Cleaner & Exhaust System Cleaner | Fuel Additive, Fix P0420/P0430, Clean Oxygen Sensor (1 fl. oz)

11% Off
8.8

Very Good

Our Rating
9

Nitrox
Nitrox Catalytic Converter Petrol Cleaner, 17 Fl Oz

22% Off
Main highlights

Engine Restoration and Emissions Reduction
Cleans engine deposits, boosts MPG, and reduces emissions.

Ideal for Pre-MOT Use
Use before MOT tests to improve emissions results.

Quick Check Engine Light Resolution
Commonly praised for turning off check engine light quickly.
8.6

Very Good

Our Rating
10

Cataclean
Cataclean 120007 Complete Engine, Fuel and Exhaust System Cleaner, 473 Milliliter (Packaging May Vary)
Main highlights

Emissions Reduction
Lowers total hydrocarbon emissions by up to 50 percent.

Versatile Vehicle Use
Safe for gasoline, diesel, hybrid, and flex-fuel vehicles.

Customer Praise for Efficiency
Effectively resolves check engine light related to catalytic converters.
8.4

Good

Our Rating

8.9
Simple to use

8.0
worth the money

8.0
distance

10 Best catalytic converter cleaners of 2025

1

Cataclean - (2) Bottle 16Oz. Fuel/Exhaust (120019)

9.1

8.0

8.0

How do we rank?

How do we rank?

Analyzing top stores

2

Cataclean (120007-2PK) Fuel and Exhaust System Cleaner - 16 fl. oz., (Pack of 2)

9.7

8.0

8.0

3

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

4

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

5

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

9.9

8.0

8.0

6

Dura Lube Severe Catalytic and Exhaust Treatment | 16 oz., 2-Pack

7

Catalytic Converter Cleaner Pass Emissions Test Cleans Catalyst, Oxygen sensor and combustion chamber cleaner, fuel additive

8.0

8.0

8

Engine Wizard - Catalytic Converter Cleaner & Exhaust System Cleaner | Fuel Additive, Fix P0420/P0430, Clean Oxygen Sensor (1 fl. oz)

9

Nitrox Catalytic Converter Petrol Cleaner, 17 Fl Oz

10

Cataclean 120007 Complete Engine, Fuel and Exhaust System Cleaner, 473 Milliliter (Packaging May Vary)

8.9

8.0

8.0

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