Selecting the best catalytic converter for your auto is significantly recognised as one of one of the most crucial decisions you will make when maintaining your auto. Whether you are seeking to maximise performance, reduce gas intake or do your little bit for the setting obtaining the ideal catalytic converter for you will conserve time, money and also avoid the migraines of falling short an MoT.

Below are some frequently asked questions regarding catalytic converters:

Why should I have a catalytic converter?

If your vehicle was fitted after 1st August 1992 with a catalytic converter from brand-new, you require to have one for the MoT. It requires to be in good working order to comply with the Federal government’s discharges regulation. The engine has been developed to deal with a Pet cat as well as besides breaking down toxic emissions, the performance will be lowered if your Pet cat is not working appropriately. You will certainly fail the yearly MoT if either it is absent or it is not in good working order.

Can I remove my Pet cat?

If your car was signed up after 1st August 1992 you have to have the Feline present as well as working for the MoT. Previously registered cars can have the Cat completely eliminated.

Why do individuals wish to remove their Felines?

Without a Feline the engine gives more power as well as decreased gasoline consumption. You might eliminate the Pet cat for track/ competition/ display usage, as an example.

Why might my Pet cat fail?

Roadway Damage

The outside of the cat can be harmed by striking strong items in the roadway. ie, speed bumps, big rocks etc

. Connected or contaminated

Plugged or infected catalytic converters are caused by the incorrect type of fuel in your cars and truck. Utilizing leaded or lead substitute gas will plug up the pillar and also trigger it to quit working. A comparable thing will certainly take place if fuel additives are used that are not suitable for usage with a catalytic converter.

Melted/ Broken substratum

A pillar is typically broken when it is impacted by an things or when it endures a sudden change in temperature. If the catalytic converter suffers roadway damage (See area on roadway damages) the pillar inside can be broken because of it being squashed by the motion on the steel can.

Making use of exhaust paste before the catalytic converter can trigger the pillar to break. When the exhaust paste has hardened, tiny pellets may escape and fire right into the catalytic converter. The monolith will progressively be destroyed by these pellets as well as break down. The catalytic converter can additionally be harmed by excessive engine resonance. Another feasible root cause of a fractured pillar is a unexpected temperature change. (See number 7 in “Caring for your Catalytic Converter”).

The monolith can be melted when unburned gas is injected right into the catalytic converter. This can be brought on by the vehicle being bump or tow began, or if the automobile’s engine requires a number of turns prior to firing. More info can be discovered on this is the section on ” Getting too hot”.


There are many problems that can create a catalytic converter to overheat or stop working. The most common cause is unburned gas getting in the catalytic converter. Additionally faulty spark plugs and also leads will certainly trigger the engine to misfire and also destroy the catalytic converter. It will likewise be harmed if the distributor timing is out.

Oxygen Sensor – An oxygen sensing unit collects and sends information to the Electronic Control System. This is used to manage the fuel/air mix. If the oxygen sensing unit is defective, or it has been polluted with silicone from anti-freeze or sealer, he fuel/air mixture will certainly not be remedied as well as excess gas will certainly enter the catalytic converter, causing it to overheat.
Gas injection systems – If a fuel injector is leaking inside or dribbling fuel right into the engine the catalytic converter may be damaged. The excess gas will certainly enter the exhaust system and trigger it to get too hot. Due to the differing fuel injector systems the appropriate manual should always be consulted when attempting to identify a trouble.
Map Sensing units – Map sensors tell the Electronic Control Unit the load on the engine and also the quantity of air entering it. If this sensor fails it creates a rich condition in the engine, which can get too hot the catalytic converter creating it to fail.
Carburettor systems – A worn or defective carburettor can trigger a catalytic converter to get too hot. Problems such as improper float or air/fuel mix adjustments and also used metering rods can damage the catalytic converter. The choke system additionally requires to be operating effectively so the right level of gas enters the system. If excessive gas enters the system it will certainly get too hot and also at some point fail.
Container Purge Valve Control – This vacuum operated valve vents fuel vapour from the carburettor dish to the charcoal container. If the vacuum is breached the charcoal cylinder will certainly flood, creating the air/fuel mix to come to be really rich. This will cause the catalytic converter to overheat as well as break down.

know more about how to recycle catalytic converters here.