Picking the best catalytic converter for your auto is progressively recognised as one of the most vital choices you will make when keeping your vehicle. Whether you are looking to increase performance, minimise gas consumption or do your bit for the atmosphere getting the ideal catalytic converter for you will certainly conserve time, cash as well as avoid the migraines of stopping working an MoT.

Here are some frequently asked questions concerning catalytic converters:

Why should I have a catalytic converter?

If your cars and truck was fitted after 1st August 1992 with a catalytic converter from new, you need to have one for the MoT. It requires to be in good working order to adhere to the Government’s discharges legislation. The engine has actually been developed to deal with a Feline as well as besides breaking down harmful discharges, the performance will certainly be decreased if your Pet cat is not working effectively. You will certainly stop working the annual MoT if either it is not present or it is not in good working order.

Can I remove my Cat?

If your car was registered after 1st August 1992 you need to have the Pet cat present as well as working for the MoT. Previously registered cars can have the Cat completely removed.

Why do people want to remove their Felines?

Without a Feline the engine offers even more power and also minimized gasoline intake. You might remove the Feline for track/ competitors/ display use, for instance.

Why might my Cat fall short?

Roadway Damages

The beyond the feline can be harmed by hitting solid items in the roadway. ie, speed bumps, big rocks and so on

. Plugged or contaminated

Plugged or polluted catalytic converters are triggered by the wrong type of fuel in your cars and truck. Making use of leaded or lead replacement fuel will plug up the pillar as well as cause it to quit working. A comparable point will take place if gas ingredients are used that are not appropriate for use with a catalytic converter.

Melted/ Busted substrate

A monolith is generally broken when it is impacted by an object or when it suffers a sudden change in temperature. If the catalytic converter suffers road damages (See area on roadway damages) the pillar inside can be cracked as a result of it being squashed by the motion on the steel can.

Making use of exhaust paste before the catalytic converter can trigger the monolith to break. When the exhaust paste has solidified, small pellets may escape and also shoot right into the catalytic converter. The pillar will progressively be damaged by these pellets as well as break down. The catalytic converter can additionally be harmed by excessive engine vibration. An additional possible cause of a fractured monolith is a sudden temperature level adjustment. (See number 7 in “Caring for your Catalytic Converter”).

The pillar can be melted when unburned gas is injected into the catalytic converter. This can be triggered by the auto being bump or tow started, or if the auto’s engine needs a number of turns before shooting. Even more details can be discovered on this is the area on “Overheating”.


There are lots of problems that can cause a catalytic converter to get too hot or fall short. One of the most common reason is unburned fuel getting in the catalytic converter. Likewise faulty ignition system and leads will certainly cause the engine to misfire as well as ruin the catalytic converter. It will certainly additionally be damaged if the distributor timing is out.

Oxygen Sensing unit – An oxygen sensor accumulates and sends out details to the Electronic Control Unit. This is made use of to manage the fuel/air mix. If the oxygen sensor is damaged, or it has actually been contaminated with silicone from anti-freeze or sealer, he fuel/air mixture will certainly not be corrected and also excess fuel will enter the catalytic converter, causing it to get too hot.
Fuel injection systems – If a fuel injector is leaking internally or oozing fuel right into the engine the catalytic converter might be damaged. The excess fuel will certainly go into the exhaust system and trigger it to overheat. Due to the varying fuel injector systems the proper guidebook need to constantly be consulted when attempting to identify a problem.
Map Sensors – Map sensing units inform the Electronic Control Unit the tons on the engine as well as the amount of air entering it. If this sensor fails it creates a abundant condition in the engine, which can get too hot the catalytic converter triggering it to stop working.
Carburettor systems – A worn or defective carburettor can create a catalytic converter to get too hot. Troubles such as inappropriate float or air/fuel mix modifications and also used metering poles can harm the catalytic converter. The choke system additionally needs to be running appropriately so the best degree of fuel enters the system. If too much fuel goes into the system it will certainly overheat as well as eventually fall short.
Canister Purge Shutoff Control – This vacuum cleaner operated valve vents gas vapour from the carburettor bowl to the charcoal cylinder. If the vacuum is breached the charcoal canister will certainly flooding, causing the air/fuel mix to come to be extremely rich. This will cause the catalytic converter to get too hot as well as break down.

know more about how to recycle catalytic converters here.