How often should I use Cataclean?

The manufacturer recommends using it four times per year to maintain proper engine operation and catalytic converter efficiency. For a first-time treatment on an older vehicle, you may want to run two consecutive treatments.

Will this fix a check engine light caused by a bad catalytic converter?

It depends on the cause. If the code is triggered by carbon buildup restricting flow, Cataclean may help clear it. If the converter is physically damaged or the substrate has collapsed, a chemical cleaner will not fix the problem and replacement is needed.

Can I use this in a diesel engine?

This specific formula is for gasoline engines, including ethanol blends. Cataclean makes a separate diesel-specific formula for diesel engines.

Cataclean Fuel and Exhaust System Cleaner 3 Liter

Name: Cataclean Exhaust & Fuel System Cleaner (3 Liter)
Brand: Cataclean
SKU: HOL120018CAT
Price: 107.91 USD
Availability: InStock

Cataclean Exhaust & Fuel System Cleaner (3 Liter)

$107.91

Usually ships the next business day

3-liter fuel and exhaust system cleaner that treats up to 30 gallons. Reduces carbon buildup in catalytic converters, oxygen sensors, and fuel injectors.

Key Features

Treats up to 30 gallons of fuel per 3-liter bottle.
EPA approved and legal in all 50 states.
Reduces total hydrocarbon emissions by up to 50 percent according to the manufacturer.
Compatible with gasoline, E10, E15, and E85 fuel blends.
Cleans catalytic converters, oxygen sensors, fuel injectors, and cylinder heads.
Pour-in application requires no tools or disassembly.

Secure CheckoutFast Shipping631-982-0042

Product Details

Carbon buildup in your catalytic converter, oxygen sensors, and fuel injectors happens gradually, and by the time you notice rough running or a check engine light, the deposits are already affecting performance. Cataclean works through the fuel system to break down that carbon as you drive, without any disassembly or special tools.

This 3-liter bottle treats up to 30 gallons of fuel, making it the bulk option for larger tanks or repeat treatments. Cataclean is EPA approved and 50-state legal, and the manufacturer states it can reduce total hydrocarbon emissions by up to 50 percent. It is compatible with gasoline, E10, E15, and E85 blends. Pour it into a low fuel tank, fill up, and drive normally for at least 15 minutes to let the formula circulate through the entire fuel and exhaust system.

For best results, Cataclean recommends using the product four times per year to maintain catalytic converter efficiency and overall fuel system cleanliness. It is not a miracle fix for a converter that is mechanically failing, but for carbon-related performance issues, it is a practical first step before considering more expensive repairs.