How Much Does It Cost to Replace a Catalytic Converter?

The catalytic converter (or simply 'cat’) is a crucial component responsible for controlling harmful emissions, so you should never ignore signs that it’s time for a replacement. But what should you look out for, and how much can you expect to pay? This guide covers all the key information.

What is a catalytic converter?

A catalytic converter is a device that controls exhaust emissions. It does this through chemical reactions, transforming toxic exhaust fumes into less harmful gases.

Cats are part of the exhaust system and can be found close to the engine block, which aids the chemical reactions through heat. Read this guide for more detailed information about what a catalytic converter is and how it works.

How much does a catalytic converter cost?

Some drivers prefer to source replacement car parts themselves. If you decide to do this, it helps to have a rough idea of how much it should cost, although prices vary.

For some cars, catalytic converters cost around £150. The price is often significantly higher for luxury high-performance cars, sometimes as much as £800, and is impacted by the vehicle size and the type of cat required.

How much does it cost to replace a catalytic converter?

A catalytic converter replacement will usually cost between £200 and £900. The price varies depending on your make and model of car, the replacement part, and the labour rate.

The average price on FixMyCar is £509.20. This figure includes parts and labour.

Average price for top car makes

The table below illustrates average price differences between some of the most popular car makes.

Average price for popular car models

How long does a catalytic converter last?

Most catalytic converters last at least ten years and many last the lifetime of a car. Eventually, though, they do wear out, and how soon this happens can be impacted by mileage and engine tune. 

If you’re worried about the condition of your cat and your vehicle is more than ten years old or has done over 100,000 miles, it’s a good idea to have it checked by a mechanic to pre-empt any potential problems.

How to tell if your catalytic converter needs replacing

There are three main signs to look out for indicating your cat is on its way out.

1. A rotten egg smell

The smell of sulphur - which is just like rotten eggs - points to an issue with the catalytic converter. When it becomes clogged, it turns hydrogen sulphide into sulphur dioxide instead of water or steam, which explains the unpleasant smell.

Find out more about why your car might smell like rotten eggs in this guide.

2. Poor acceleration

Your engine’s ability to get rid of exhaust gases and draw in clean are are interlinked, and when there is a clog in the exhaust system - including in the cat - it disrupts this process. When your engine can’t mix air and fuel efficiently, it results in reduced power and poor acceleration.

Learn about how exhausts work here.

3. Illuminated check engine light

Finally, your check engine light (also known as the engine management light) may come on to signal this problem, especially if your car is struggling to accelerate due to issues with the air-fuel mixture.

This guide covers all the reasons why your engine management light might come on.

Think your catalytic converter needs replacing? FixMyCar can help you find the right garage at the right price.

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