How often should you service your car’s exhaust system?

The exhaust system is vital for safely directing harmful gases away from your car, maintaining engine performance, and reducing noise and emissions. Here’s how often it should be serviced and the warning signs to watch for when problems develop.

Regular exhaust system maintenance keeps your car safe, efficient, and running cleanly. A typical service involves checking for leaks, rust, and damage, and replacing worn parts before they cause bigger issues.

Over time, exhausts can corrode or develop faults, leading to louder noise, poor performance, and higher emissions. Staying on top of checks helps you avoid costly repairs and keeps your car running smoothly.

This handy guide explains how often you should service your exhaust system, what factors affect their performance, and the key signs that it’s time for a replacement or repair.

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What does the exhaust system do in a car?

The exhaust system in your car is responsible for safely carrying away the gases produced by the engine after fuel is burned. It directs these gases away from the cabin, helping to protect you and your passengers from harmful fumes,

It also plays an important role in reducing emissions, as components such as the catalytic converter help convert harmful pollutants into less damaging gases before they are released into the atmosphere. The exhaust system reduces engine noise, through a silencer or muffler, making the car much quieter to drive, too.

By managing the flow of gasses efficiently, it also supports the overall engine performance and fuel efficiency.

How often should you service your exhaust system?

You should have your exhaust system checked at least once a year, or around 10,000 miles. This should be done during your annual service,and helps catch issues such as rust, leaks or damage early – all before they become more serious or expensive to fix. The exhaust system is also checked as part of your yearly MOT inspection, as any damage will result in your car failing.

What are the signs you need a new exhaust system?

Even outside of your regular servicing schedule, your car will often give you clear signs when the exhaust system is starting to fail. Here are six warning signs to watch out for:

1. Louder than usual noise: A roaring, hissing, or rattling sound could point to a hole, crack, or loose part in the exhaust.
2. Reduced performance or higher fuel use: If your car feels sluggish or is using more fuel than normal, the exhaust could be blocked or leaking.
3. Strong or unusual smells: A “rotten egg” smell or exhaust fumes inside the car is a serious warning sign and should be checked immediately.
4. Visible rust or damage: Look out for corroded pipes, holes, or parts hanging loose under the car.
5. Vibrations while driving: Excessive vibrations through the steering wheel, pedals, or seats can signal an exhaust issue.
6. Check engine light comes on: Problems with the exhaust system can trigger dashboard warning lights, especially if emissions are affected.

Exhaust system FAQs

How much does it cost to replace the exhaust system?

Replacing an exhaust typically costs between £100 and £500, depending on the part and the overall condition of the system, according to FixMyCar. Smaller components such as the tailpipe can cost £100 to £300, while more complex parts such as the exhaust manifold can exceed £900.

How long does it take to replace the exhaust system?

Replacing an exhaust system usually takes around one to four hours when done by a professional. The exact time depends on the condition of the car and what needs replacing.

A simple repair, such as swapping out a muffler, can take as little as 30 to 60 minutes. However, if the system is heavily rusted, difficult to remove, or a full exhaust replacement is needed, it can take longer – sometimes up to six hours or more.

Can I replace the exhaust system myself?

Yes, you can replace an exhaust system yourself, as it’s usually a bolt-on job rather than a complex engine repair. However, it can be physically demanding, especially if parts are rusted or stuck.

You’ll need basic tools, proper safety equipment, and a safe way to lift and support the car.

Can I use any exhaust system on my car?

No, you can’t use just any exhaust system on your car.

In the UK, replacement exhausts need to be suitable for your specific make and model, and they must meet legal requirements for emissions and noise. The system should also be properly approved so it doesn’t make your car louder than it’s allowed to be or affect how it performs.

Using the wrong exhaust can cause problems like leaks, reduced performance, or even an MOT failure, so it’s important to choose one that’s designed and approved for your vehicle.

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