Catalytic converters are fitted as part of many cars exhaust systems. The job of the catalytic converter is to reduce the emission of pollutants caused by incomplete combustion in the engine by means of a chemical reaction. They commonly contain a catalyst (a material that facilitates a reaction without being used up in the reaction) made of precious metals such as platinum and are therefore quite expensive. Un-burnt fuel passing through the engine into the exhaust can damage the catalytic converter so it’s important to avoid this if possible. Certain fuel additives may cause damage so always consult the manufacturer’s instructions before using them.

First off, you should keep your car regularly serviced and don’t ignore ECU warning lights as a poorly running engine can cause damage to the converter. Don’t bump start or tow the car as this can force fuel into the exhaust. Also, towing heavy things like caravans can push a car when going downhill, again forcing un-burnt fuel through the engine so take care not to overload trailers.

The catalytic converter operates at very high temperatures and this can cause issues when driving through water. The outer casing may contract faster than the inside of the converter causing damage. Also be aware that parking in long grass could present a fire risk due to the converters high temperature.