Catalytic & Exhaust Treatment (Emissions Test, Error Light) 16 oz

Regular price $24.99 Sale price $19.99 Save $5.00
-1031 in stock

Formulated to protect and treat the Catalytic Converter & Exhaust System from oil poisons. This will aid in reducing the carbon footprint of your vehicle and improving overall performance; helping to  increase fuel efficiency, and protect your converter. 



    • Use when warning light is activated
    • Use before or prior to replacing catalytic converter
    • Protects catalytic system from oil poisons
    • Reduces phosphorus & zinc retention levels at catalyst inlet
    • Helps clean oxygen ( O2 ) sensor(s)
    • Lowers tail pipe emissions
    • Works great for P0420 Catalytic Converter Code


Add full bottle into 16 gallons of fuel or 1 oz. per gallon. 

Last up to 6 months or 7,000 miles (which ever comes first.)

This gasoline additive is safe for use in all gasoline engines, all catalytic converters and oxygen sensors, when used as directed.


Proposition 65 Warning for California Consumers:

⚠️WARNING: This product can expose you to chemicals including Naphthalene, which is known to the State of California to cause cancer. For more information, go to

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Customer Reviews
4.1 Based on 15 Reviews
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Norm H.
United States United States
I recommend this product
Check Engine Light - now Off !

Super fast order response and shipping. Took both cans... first on a full tank... no difference. Second on less than a quarter tank and later filled with non-ethanol. About a hundred miles later, the Check Engine light went off ! 240,000 miles on a 2005 Toyota RAV4... which has 4 (four !) O2 sensors.

Bill M.
United States United States
I recommend this product
Catalytic and Exhaust Treatment

I have added it to the fuel tank but have not yet driven the car. I plan to offer a report later.

TIm F.
United States United States


United States United States
motorkote purchase

yes, very good

John M.
United States United States
Catalytic & Exhaust Treatment

Only added it to fuel about 40 miles ago,in my old 96 Jeep Cherokee, but am sure it will help as every Motorkote product in the past has done what it says. I have never had a bad experience with any Motorkote product.