Cataclean 120019 Fuel & Exhaust System Cleaner, 16 oz, 2-Pack – Catalytic Converter, Injector & O2 Sensor Cleaner (Gasoline)

What it is

A fuel additive that cleans carbon from the fuel system, combustion chamber and, as it burns, from the oxygen sensors and catalytic converter. It is the product people reach for when a check-engine light shows a catalyst efficiency code (P0420/P0430) or a car is borderline on an emissions test; it does not fix a dead converter, but it clears the deposits that make a marginal one fail.

Fits

Any gasoline or hybrid car or truck. One bottle per treatment, added to roughly a quarter tank so the concentration is right, then drive at least 15 minutes to get the exhaust hot before filling up. This two-pack covers two treatments or two vehicles. The diesel version is a separate product.

What's in the box

Two 16 oz bottles.

How to use

Pour, drive, refuel; repeat every 3,000 miles or before an emissions test. Clear stored codes after the treatment and drive a full cycle before re-testing.

Why Cataclean

Cataclean has published emissions test data behind it and is distributed in the US by Holley; it is the best-known of the catalyst-cleaning additives, which is why it is one of the store's top eBay sellers.

All gasoline engines (and hybrids), one 16 oz bottle treats one tank. Pour into about a quarter tank, drive 15 minutes, refuel. Not the diesel formula.

Fitment data from the manufacturer catalogue. Check your engine before ordering, or call us.

Shipping. Free on every order, US only. Orders arrive in 2–4 days.

Returns. 30-day returns, except in extreme cases.

Support. Our team is available 24/7 for fitment mismatches or any other reason.

Warranty. Full manufacturer guarantee.