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Catalyst check and replacement

The catalytic converter is a key component of the exhaust system, and its job is to neutralise the hazardous combustion gases leaving the engine. If the converter becomes blocked, is damaged by an impact or burns out internally, engine power drops, fuel consumption rises and the vehicle will fail its roadworthiness test. Carstop specialists assess catalytic converter efficiency with dedicated tests and quickly carry out replacement with either a model-specific or a universal converter.

Carstop workshops include the following among their maintenance services

Catalytic converter efficiency and emissions test
Catalytic converter replacement and exhaust system repair
Fitting universal and model-specific catalytic converters

How to recognise when you should bring your car in for a check

The engine has noticeably lost power
If the catalytic converter is blocked or its internals have melted together, exhaust gases cannot escape freely. This creates back pressure on the engine, making the car sluggish and hard to accelerate.
Fuel consumption has increased unexpectedly
Because a blocked catalytic converter disrupts the engine's gas exchange and the operation of sensors (such as the lambda sensor), the car can no longer burn fuel efficiently, which immediately raises fuel consumption.
A rattling or clattering sound from under the car
If the ceramic honeycomb element inside the catalytic converter is damaged by an impact or by age, it breaks into pieces. These loose pieces then rattle inside the housing at idle or under acceleration.

Read more about the service

What does the catalytic converter do in a car?
The catalytic converter is the part of the exhaust system that uses chemical reactions to neutralise harmful gases from the engine (such as carbon monoxide) into less hazardous compounds, keeping the car environmentally friendly.
Why do catalytic converters usually fail?
The main causes are engine faults (unburnt fuel or oil reaching the exhaust and burning out the honeycomb structure), mechanical impacts against bumps in the road, or simply natural wear and ageing of the ceramic core.
Can you keep driving with a faulty catalytic converter?
Driving for long is not recommended. A blocked catalytic converter overheats, puts strain on the engine and can eventually cause serious engine damage. On top of that, a car in this condition cannot pass the roadworthiness test.
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