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Catalytic converter repair

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What is a catalytic converter and what does it do?

A catalytic converter is a chemical filter that is placed in the exhaust. It ensures that harmful gases from the exhaust are thoroughly filtered so that the exhaust gases that leak out into the air around us are relatively harmless. In other words, the catalytic converter reduces the car's pollution.

The catalytic converter is connected to the exhaust centre section - or mid pipe - which passes the gases to the muffler. After the muffler, which limits noise, the exhaust pipe comes, after which the gases are released.

How does a catalytic converter work?

A catalytic converter is often referred to in a chemical context where a chemical substance converts other substances in a chemical reaction, though without being included in the process itself.

Catalytic converters have been mandatory for all petrol cars since 1990. It reduces harmful substances such as nitrogen oxide, carbon monoxide and hydrocarbons, so cars do not harm the environment to a large extent.

For that reason, it can also be dangerous if there is a hole in the exhaust line before the catalytic converter. Here, the harmful exhaust gases can escape unfiltered and it is both toxic to humans and the environment. Therefore, be sure to drive to a garage immediately if this happens.

Hopefully though, your catalytic converter should not be replaced in your car’s lifetime as it is designed to last for a long time. But it may well need a repair for some reason. Should it, however, need a full replacement, see below for an estimation on the price.

If there is a hole in the exhaust after the catalytic converter, damage is less risky - but you should still get it fixed.

Average cost on exhaust work

Below you can see the cost for general exhaust work on selected car brands. Book work on the catalytic converter at the mechanic here:

Make Avg. price Min - max
Citroën £ 125 £ 72 - £ 234 Get quotes
Fiat £ 116 £ 75 - £ 175 Get quotes
Ford £ 163 £ 91 - £ 282 Get quotes
Honda £ 107 £ 45 - £ 197 Get quotes
Nissan £ 211 £ 96 - £ 443 Get quotes
Peugeot £ 189 £ 95 - £ 388 Get quotes
Toyota £ 153 £ 95 - £ 288 Get quotes
Vauxhall £ 155 £ 95 - £ 258 Get quotes
Volkswagen £ 208 £ 88 - £ 330 Get quotes
Volvo £ 519 £ 209 - £ 677 Get quotes

The prices are based on all quotes sent via, and may contain errors or vary. Please create a job if you would like detailed quotes for your car.

How much is a catalytic converter, repair and cost

When going through MOT, they check whether the car emits gases with values under current environmental permissions. It is often here that you discover that the catalytic converter must be repaired.

You can ask your mechanic if it’s enough to get a catalytic converter cleaner. In some cases it may be enough. But at, we recommend that a repair is best, as it is often a short-termed solution that does not last long.

The spare part itself comes at a price between £200 and £500. But the catalytic converter replacement cost includes time spent on removing the old one and have the new one installed, so it's not a cheap repair. Taking between 2 and 4 hours to do, the total price for the replacement amounts to between £500 and £700. The catalytic converter, however, is an important part of the car's exhaust, which helps keep the exhaust free of harmful gases. Your car's catalytic converter should be in top condition.

If the catalytic converter is rusty and has a hole, it may be patched. As mentioned above, you should be prepared, however, if your car is older, in rare instances you will need to replace it.

Therefore, it's also a good idea to ask for quotes on the job through, so you can save money on the repair of your car's catalytic converter.

Read more about the Catalytic converter in our blogposts:

Customer reviews of exhaust repairs

Excellent customer service. Work carried out to perfection
Mike N.
Mercedes-Benz E-CLASS (2005)
Efficient and price as published
Matthew L.
Opel Insignia (2009)
Very polite and courteous
Michael H.
Suzuki Wagon R+ (2002)