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

Regular price $24.99 Sale price $18.99 Save $6.00
-1292 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

Customer Reviews
4.4 Based on 22 Reviews
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richard h.
United States
I recommend this product

MotorKote ReelKote

This product solved my O2 sensor issue in 48 hrs, saving me significant service cost.

Michael M.
United States United States

Catalytic treatment

1000 miles so far and nothing yet. Reset engine light 4 times so far. Not sure if something else is going on. 163k on vehicle. Will have diagnostics ran on vehicle later this week.

Rich H.
United States United States
I recommend this product

MotorKote cleaner-O2 sensors

Good afternoon Ed. I just wanted to tell you my experience with your MotorKote cleaner/solvent for O2 sensors. My engine light was on and after adding your product the light went off within 24hrs. I wish I would have had that earlier this year as I had a sensor replaced and I think it was probably dirt rather than a failed component. Because of its location on the engine it was very expensive. Richard H.

Steve G.
United States United States

Awesome stuff

I think it has helped the truck run better and better gas mileage! Thanks!

Deron M.
United States United States
I recommend this product

Past emissions 2 years in a row using this product

My 1995 Acura Legend, quite modified, cat delete, 363K still running the original engine, the C32, passed recently after using one bottle of Motorkote Catalytic & Exhaust Treatment (Emissions Test, Error Light) 16 oz. I did not have a check engine light on, however passed and I believe next year our county is doing away with the test so I'll probably have to do one more time. Guess what I will be adding this product to the gas tank prior to going with an Italian tune up on the way to the emissions location. 5 BIG �����