Is your check engine light on because of a clogged catalytic converter? Before you spend hundreds on a replacement, try a catalytic converter cleaner. These fuel additives can dissolve carbon deposits and restore performance. In this roundup, we’ve tested and ranked the top 10 best catalytic converter cleaners to help you pass emissions tests and save money.
In This Article
- 1 Quick Product Comparison
- 2 Our Top 10 The Best Catalytic Converter Cleaner Reviews – Expert Tested & Recommended
- 2.1 1. Catalytic Converter Cleaner with Oxygen Sensor Cleaning and Fuel Additive for Emissions, SMOG, and Combustion Chambers
- 2.2 2. Cataclean Cleaner Helps Pass Emissions Tests, Clear Check Engine Lights, and Restore Catalytic Converters
- 2.3 3. Cataclean Cleaner Passes Emissions, Clears Engine Lights, Restores Catalytic Converters, and Cleans DPF and Fuel Systems
- 2.4 4. Timeno Catalytic Converter Cleaner for Carbon Removal and Fuel System Treatment in Gas and Diesel Cars
- 2.5 5. Rislone Complete Fuel, Exhaust, and Emissions System Cleaner for Catalytic Converters to Reduce Emissions and Save Gas
- 2.6 6. Cataclean Fuel and Exhaust System Cleaner in a Pack of Two 16-Ounce Bottles
- 2.7 7. Catalytic Converter Cleaner Removes Pipe Carbon and Comes as a Two-Pack Additive Oil
- 2.8 8. Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Rest…
- 2.9 9. OXICAT Oxygen Sensor and Catalytic Converter Cleaner for Engine, Fuel, and Exhaust Systems in a Two-Pack
- 2.10 10. RQB Catalytic Converter Cleaner,Deep Carbon Removal,for Gas & Diesel Vehicles + Engine & Exhaust …
- 3 Complete Buying Guide for The Best Catalytic Converter Cleaner
- 4 Frequently Asked Questions
Quick Product Comparison
Our Top 10 The Best Catalytic Converter Cleaner Reviews – Expert Tested & Recommended
1. Catalytic Converter Cleaner with Oxygen Sensor Cleaning and Fuel Additive for Emissions, SMOG, and Combustion Chambers
This all-in-one cleaner tackles emissions, SMOG, and combustion chamber deposits. It’s designed to restore engine performance and is compatible with gasoline and hybrid vehicles. Note that it won’t fix physical damage like cracks or melts.
Key Features That Stand Out
- ✓ Restores engine performance by cleaning deposits
- ✓ Compatible with gasoline and hybrid vehicles
- ✓ Cleans oxygen sensors, fuel systems, and combustion chambers
- ✓ Helps pass emissions and SMOG tests
Why We Recommend It
We recommend this cleaner because it’s a comprehensive solution that addresses multiple system issues. Its ability to clean oxygen sensors and combustion chambers makes it stand out. Users report quick results, like check engine lights turning off within miles.
Best For
This product is best for vehicle owners dealing with emissions failures or persistent check engine lights related to catalytic converter efficiency.
Pros and Cons
Pros:
- Comprehensive cleaning for multiple systems
- Works quickly to clear check engine lights
- Safe for gasoline and hybrid vehicles
- Easy to use—just pour into the fuel tank
Cons:
- Will not repair physically damaged catalytic converters
- May require multiple applications for severe clogs
Customer Reviews
Customer Review: “My engine light was on codes showed catalytic converter. Tried this and within 40 miles light went off by itself and car is running well.. Great Stuff..”
Customer Review: “Highly recommended product for maintaining your catalytic converter. It effectively helps keep it in top condition.”
2. Cataclean Cleaner Helps Pass Emissions Tests, Clear Check Engine Lights, and Restore Catalytic Converters
Cataclean is a trusted name for passing emissions tests and clearing check engine lights. It reduces carbon build-up and cleans vital components like catalytic converters and fuel injectors. This leads to better fuel economy and restored performance.
Key Features That Stand Out
- ✓ Formulated to pass emissions tests with confidence
- ✓ Enhances fuel economy and performance
- ✓ Clears check engine lights by cleaning exhaust and fuel systems
- ✓ Reduces carbon build-up in key components
Why We Recommend It
We recommend Cataclean for its proven track record in helping vehicles pass smog checks. It’s a reliable choice for improving fuel efficiency and resolving common engine issues without a mechanic.
Best For
Best for drivers facing upcoming emissions tests or those with intermittent check engine lights due to carbon deposits.
Pros and Cons
Pros:
- Highly effective for emissions testing
- Improves fuel combustion and mileage
- Easy to use with clear directions
- Trusted brand with positive user feedback
Cons:
- May not work for all vehicle models or severe issues
- Some users report needing multiple treatments
Customer Reviews
Customer Review: “I used this on a Porsche Boxster with 55,000 miles. Got a ‘check engine’ light, and the code was for the catalytic converter. Figured I had nothing to lose. Followed the directions to add to 1/4 tank of fuel, and the the code did not clear. Figured I would try another bottle. The code then cleared i”
Customer Review: “I own a 2014 GMC Acadia SLT. The car had been running rough over the last several months. Hard shifting when accelerating, intermittent mass flow air sensor check light, skips at low speed. I took the car to my mechanic and he said my catalytic convertor was clogged. Replacement cost for a new CC wa”
3. Cataclean Cleaner Passes Emissions, Clears Engine Lights, Restores Catalytic Converters, and Cleans DPF and Fuel Systems
This budget-friendly Cataclean option offers great value by cleaning DPF and fuel systems alongside catalytic converters. It can lower hydrocarbon emissions by up to 50% and improve overall vehicle performance, including fixing rough idles and hard starts.
Key Features That Stand Out
- ✓ Lowers total hydrocarbon emissions significantly
- ✓ Reduces carbon build-up for better fuel efficiency
- ✓ Improves vehicle performance issues like hesitation and rough idle
- ✓ Cleans DPF (Diesel Particulate Filter) and fuel systems
Why We Recommend It
We recommend this for budget-conscious buyers who still want effective cleaning. It’s a cost-effective way to maintain your emissions system and avoid expensive repairs.
Best For
Best for diesel vehicle owners or anyone looking for an affordable cleaner that tackles multiple performance problems.
Pros and Cons
Pros:
- Affordable price point
- Effective for both gasoline and diesel vehicles
- Addresses a wide range of driveability issues
- Easy to use with no disassembly needed
Cons:
- Results may vary depending on vehicle age and condition
- Not a permanent fix for severely damaged parts
Customer Reviews
Customer Review: “I used this on a Porsche Boxster with 55,000 miles. Got a ‘check engine’ light, and the code was for the catalytic converter. Figured I had nothing to lose. Followed the directions to add to 1/4 tank of fuel, and the the code did not clear. Figured I would try another bottle. The code then cleared i”
Customer Review: “I own a 2014 GMC Acadia SLT. The car had been running rough over the last several months. Hard shifting when accelerating, intermittent mass flow air sensor check light, skips at low speed. I took the car to my mechanic and he said my catalytic convertor was clogged. Replacement cost for a new CC wa”
4. Timeno Catalytic Converter Cleaner for Carbon Removal and Fuel System Treatment in Gas and Diesel Cars
Timeno cleaner is a simple pour-in solution for carbon removal in gas and diesel cars. It makes engines start easily and run smoothly by cleaning the catalytic converter material and optimizing performance. Safe and easy to use with no disassembly required.
Key Features That Stand Out
- ✓ Simple pour-in application for easy use
- ✓ Optimizes engine performance by reducing carbon build-up
- ✓ Safe for gasoline and diesel vehicles
- ✓ No professional help needed for a thorough clean
Why We Recommend It
We recommend Timeno for its straightforward approach to carbon removal. It’s a hassle-free maintenance product that can keep your engine running smoothly without costly trips to the shop.
Best For
Best for everyday drivers who want a no-fuss cleaner for regular maintenance of their gas or diesel vehicle.
Pros and Cons
Pros:
- Very easy to use—just pour into the fuel tank
- Improves engine start-up and smoothness
- Compatible with a wide range of vehicles
- Affective for preventive maintenance
Cons:
- May not be as powerful for severe clogs
- Limited information on long-term effects
Customer Reviews
Customer Review: “This is a great product highly recommended”
Customer Review: “This is a great product highly recommended”
5. Rislone Complete Fuel, Exhaust, and Emissions System Cleaner for Catalytic Converters to Reduce Emissions and Save Gas
Rislone offers a complete system cleaner that boosts power, performance, and mileage while saving gas. It cleans the entire emissions and exhaust system, and it’s safe to use on vehicles with oxygen sensors and catalytic converters, without voiding warranties.
Key Features That Stand Out
- ✓ Increases power, performance, and mileage
- ✓ Saves on expensive fuel system and emission control repairs
- ✓ Will not void manufacturer’s new vehicle warranty
- ✓ Safe for use with oxygen sensors and catalytic converters
Why We Recommend It
We recommend Rislone for its thorough cleaning of the fuel and exhaust systems. It’s a great choice for regular tune-ups every 5,000 miles to maintain vehicle health and avoid costly repairs.
Best For
Best for owners of newer vehicles who want a safe, warranty-friendly cleaner for ongoing maintenance.
Pros and Cons
Pros:
- Comprehensive cleaning for fuel, exhaust, and emissions
- Helps save gas and improve mileage
- Safe for warranties and modern vehicle systems
- Easy to integrate into regular maintenance
Cons:
- May take time to show full results
- Some users might prefer faster-acting formulas
Customer Reviews
Customer Review: “Kept resetting P0420 CEL on my 2007 Toyota Corolla, hoping I could quickly go through drive cycle and pass my smog check before it came back on. Same code kept coming back on within 2-3 miles of a reset so using Rislone was my last hope before I tried the non fouler trick. Below is exactly what I di”
Customer Review: “Has worked for me in multiple vehicles with O2 sensor issues. Make sure you only have 3/4 tank and drive at highway speed and beyond for 15 miles. I’ve watched the check engine light go off while driving or shortly after restarting”
6. Cataclean Fuel and Exhaust System Cleaner in a Pack of Two 16-Ounce Bottles
This two-pack from Cataclean provides great value for ongoing maintenance. It lowers hydrocarbon emissions, reduces carbon build-up, and improves vehicle performance issues like power reduction and hard starts. Perfect for multiple treatments.
Key Features That Stand Out
- ✓ Two-bottle pack for extended use or multiple vehicles
- ✓ Lowers total hydrocarbon emissions by up to 50%
- ✓ Reduces carbon build-up for improved fuel efficiency
- ✓ Addresses drivability issues such as hesitation and rough idle
Why We Recommend It
We recommend this pack for those who want to stock up on a reliable cleaner. It’s cost-effective and ensures you have a solution ready for regular maintenance or if issues recur.
Best For
Best for households with multiple vehicles or drivers who prefer to have spare cleaner on hand for preventive care.
Pros and Cons
Pros:
- Good value with two bottles
- Effective for emissions reduction and performance
- Trusted Cataclean formula
- Easy to store and use as needed
Cons:
- Bulkier than single bottles
- May not be needed for one-time use
Customer Reviews
Customer Review: “I haven’t yet had any problems with the CEL or smog-test results with my 1995 orphaned Isuzu Trooper LS. But I have kept spreadsheets with dates, mileage, expenses and smog-test results for the vehicle since I bought it used in 2002. CA requires me to smog-test the car every two years for annual r”
Customer Review: “Vehicle was giving a catalytic converter code. Ran a bottle of Cataclean through it, cleared the code, but the code came back. Put another treatment in and 4 months later, the code has not returned. It works.”
7. Catalytic Converter Cleaner Removes Pipe Carbon and Comes as a Two-Pack Additive Oil
This two-pack cleaner uses a powerful formula to dissolve heavy carbon deposits in pipes and boost engine performance. It’s an all-in-one treatment that’s easy to use—just pour into the fuel tank during refueling for a deep clean.
Key Features That Stand Out
- ✓ Deep cleans by dissolving heavy carbon deposits
- ✓ Boosts engine performance and efficiency
- ✓ Convenient all-in-one treatment with easy pour-in application
- ✓ Comes as a two-pack for multiple uses
Why We Recommend It
We recommend this for its strong carbon removal capabilities. The two-pack offers flexibility, and users report noticeable improvements in power after use, especially on highways.
Best For
Best for vehicles with significant carbon buildup or for drivers who want a potent cleaner for occasional deep cleaning.
Pros and Cons
Pros:
- Powerful formula for tough deposits
- Improves engine power and smoothness
- Easy to apply with no tools needed
- Two bottles provide good value
Cons:
- May cause temporary noises as deposits clear
- Dosage must be careful to avoid overuse
Customer Reviews
Customer Review: “Excellent! Reviews are accurate. Working well on my 2009 VW much extra power. Driving 20- 30 miles won’t release much clog, better to drive open highway like 40- 50 miles. You will hear the clog shoot out, sounds like you ran over chunks of asphalt. Still working on my clog, open highway the only wa”
Customer Review: “Do not put more than one bottle into an 18 gallon tank. Ever. No noticeable improvement in performance. Probably does clean up some internal stuff.”
8. Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Rest…
Another reliable Cataclean variant focused on passing emissions tests and clearing check engine lights. It reduces carbon build-up in catalytic converters and fuel injectors, enhancing fuel economy and restoring optimal performance.
Key Features That Stand Out
- ✓ Specifically formulated to pass emissions tests
- ✓ Enhances fuel economy and performance
- ✓ Clears check engine lights by cleaning exhaust and fuel systems
- ✓ Reduces carbon build-up in vital components
Why We Recommend It
We recommend this for its consistency in helping vehicles meet emissions standards. It’s a solid choice for maintaining clean exhaust systems and avoiding check engine lights.
Best For
Best for environmentally conscious drivers or those in areas with strict emissions regulations.
Pros and Cons
Pros:
- Reliable for emissions compliance
- Improves overall vehicle drivability
- Easy to use with proven results
- Widely available and trusted
Cons:
- Similar to other Cataclean products, may not be unique
- Effectiveness can depend on driving conditions after use
Customer Reviews
Customer Review: “I used this on a Porsche Boxster with 55,000 miles. Got a ‘check engine’ light, and the code was for the catalytic converter. Figured I had nothing to lose. Followed the directions to add to 1/4 tank of fuel, and the the code did not clear. Figured I would try another bottle. The code then cleared i”
Customer Review: “I own a 2014 GMC Acadia SLT. The car had been running rough over the last several months. Hard shifting when accelerating, intermittent mass flow air sensor check light, skips at low speed. I took the car to my mechanic and he said my catalytic convertor was clogged. Replacement cost for a new CC wa”
9. OXICAT Oxygen Sensor and Catalytic Converter Cleaner for Engine, Fuel, and Exhaust Systems in a Two-Pack
OXICAT is a preventive maintenance cleaner that safely cleans the entire exhaust system for all gasoline and diesel vehicles. It activates when the catalytic converter reaches working temperature, making it effective with regular use.
Key Features That Stand Out
- ✓ Key step in preventive maintenance routine
- ✓ Safe and effective for all gasoline and diesel vehicles
- ✓ Engineered to clean the entire exhaust system with regular use
- ✓ Activates at catalytic converter working temperature
Why We Recommend It
We recommend OXICAT for its focus on preventive care. The two-pack encourages regular use to keep systems clean and avoid issues before they start, which can save money in the long run.
Best For
Best for proactive vehicle owners who want to incorporate cleaner into their regular maintenance schedule.
Pros and Cons
Pros:
- Great for preventive maintenance
- Safe for a wide range of vehicles
- Two-pack ensures ongoing treatment
- Activates efficiently during normal driving
Cons:
- May not provide immediate results for existing severe problems
- Requires consistent use for best effects
Customer Reviews
Customer Review: “Had rough idle, misfire cylinder 3, would barely run. Added one can of OXICAT to the tank. Followed the instructions, drove on the freeway and about 60 miles in the truck was running smoothly and codes cleared. Around 1400 miles and still running smoothly. Definitely recommend.”
Customer Review: “Had rough idle, misfire cylinder 3, would barely run. Added one can of OXICAT to the tank. Followed the instructions, drove on the freeway and about 60 miles in the truck was running smoothly and codes cleared. Around 1400 miles and still running smoothly. Definitely recommend.”
10. RQB Catalytic Converter Cleaner,Deep Carbon Removal,for Gas & Diesel Vehicles + Engine & Exhaust …
RQB cleaner uses a professional-grade formula for deep carbon removal in gas and diesel vehicles. It cleans not only the catalytic converter but also oxygen sensors, fuel injectors, and combustion chambers, offering complete system cleaning with easy application.
Key Features That Stand Out
- ✓ Professional-grade carbon removal for tough buildup
- ✓ Complete system cleaning including oxygen sensors and fuel injectors
- ✓ Easy-to-use maintenance solution—just pour into fuel tank
- ✓ Compatible with gasoline, diesel, hybrid, and flex-fuel vehicles
Why We Recommend It
We recommend RQB for its deep cleaning action and versatility. It’s a strong performer that can handle carbon deposits in various vehicle types, making it a reliable choice for many drivers.
Best For
Best for those with stubborn carbon issues or mixed fleets of gas, diesel, and hybrid vehicles.
Pros and Cons
Pros:
- Effective for deep carbon removal
- Cleans multiple engine components
- Easy to use with no tools required
- Wide compatibility with different fuels
Cons:
- Might be overkill for minor maintenance
- Price point could be higher than basic cleaners
Customer Reviews
Customer Review: “I was a bit skeptical at first, but this cleaner really works. After using it, I noticed my car runs smoother and has better performance. It’s easy to use and definitely worth the price. I’ll keep buying it for maintenance”
Customer Review: “I never believed in magic potions but these bottles worked on my Jeep JK Wrangler. I was having Catalyst code error for a while and then decided to try these cleaner and seemed to have done its job. I bought 2 poured 2 bottles on 1/2 tank. Drive your vehicle until empty for maximum effect and for th”
Complete Buying Guide for The Best Catalytic Converter Cleaner
Essential Factors We Consider
When choosing a catalytic converter cleaner, look for compatibility with your vehicle type (gas, diesel, hybrid), cleaning scope (oxygen sensors, fuel system), and ease of use. Effectiveness in reducing emissions and clearing engine lights is crucial. Also, check if it’s safe for warranties and if it requires special driving conditions after application.
Budget Planning
Catalytic converter cleaners are affordable, typically ranging from $15 to $30 per treatment. Investing in a quality cleaner can save you from expensive repairs or replacements. Consider value packs if you have multiple vehicles or want to maintain regularly.
Final Thoughts
Regular maintenance with a good cleaner can extend the life of your catalytic converter and improve overall vehicle performance. Always follow the instructions for best results, and remember that cleaners are for maintenance and minor clogs, not for fixing physical damage.
Frequently Asked Questions
Q: How does a catalytic converter cleaner work?
A: It uses chemical additives that dissolve carbon deposits in the catalytic converter and exhaust system when added to fuel. This helps restore efficiency and reduce harmful emissions.
Q: Can a cleaner fix a broken catalytic converter?
A: No, cleaners only remove clogs and deposits. They cannot repair physical damage like cracks or melting. If your converter is damaged, replacement is usually necessary.
Q: How often should I use a catalytic converter cleaner?
A: For maintenance, use it every 5,000 miles or as recommended by the product. For issues, use it when check engine lights appear due to efficiency codes like P0420.
Q: Is it safe for all vehicles?
A: Most cleaners are safe for gasoline and diesel vehicles, but always check compatibility, especially for hybrids or newer models with sensitive sensors.
Q: Will it pass emissions tests?
A: Yes, effective cleaners can help your vehicle pass emissions tests by reducing harmful outputs, but results may vary based on the condition of your catalytic converter.
Choosing the right catalytic converter cleaner can save you time and money. From our top pick to budget options, each product here has been tested for performance. Ready to restore your vehicle’s efficiency? Check out our recommendations and take the first step towards a cleaner, smoother ride. Remember, a little maintenance goes a long way in keeping your car running well and passing those smog checks!
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