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What is a Catalytic Converter or Cat?
The Catalytic Converter (commonly known as a Cat) is a device that helps to reduce the harmful emissions from your vehicle's engine.


How does it work?
The Cat works by filtering the exhaust gases through an internal honeycomb section known as a Monolith. The Monolith is either ceramic or metal and is coated with precious metals such as Platinum, Palladium and Rhodium. Using a combination of heat and precious metals the Catalytic Converter promotes a chemical reaction that reduces the harmful emissions of hydrocarbons, carbon monoxide and nitrogen oxides and converts them into water vapour and less harmful gases.

Why do I need to replace it?
If the exhaust system is grounded or impacted in any way this can cause the ceramic monolith inside to collapse leading to failure of the unit.

If you drive through water when the Cat is at full working temperature the sudden cooling of the Cat can cause it to contract rapidly and therefore break up internally.

If your engine develops a misfire this can overheat and damage the Cat. A misfiring engine will send un-burnt fuel down your exhaust to collect in the Cat where it will ignite causing it to overheat.


Cats 2 U. The UK's Leading Catalytic Converter Supplier