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How Your Exhaust Works & What the Parts Do

Your exhaust system is made up of several parts, and a problem with any of them can affect your car’s performance, how much noise it makes and the emissions it produces.

• Catalytic converter. Sits nearer the engine and cleans the exhaust gases, speeding up the removal of harmful gases produced during combustion.

• Diesel particulate filter (DPF). Diesel cars only. If your diesel car is struggling to perform, the DPF may need cleaning.

• Lambda sensor. A faulty lambda sensor can reduce performance and fuel efficiency and increase emissions.

• EGR valve. Reduces harmful emissions and maintains your car’s performance levels.

• Back box (rear silencer). The last box in the system before the tailpipe, which cancels out much of the engine’s noise before it leaves the car.

Common Signs Something's Wrong With Your Exhaust

If you notice any of the following, it’s worth getting your exhaust checked by a local garage:

• Rattling, roaring or hissing noises

• A drop in fuel efficiency

• Visible damage or rust on the exhaust

• A smell of exhaust fumes inside your car

The colour of any smoke coming from your exhaust can also give you a clue:

• White smoke can be a sign of a coolant leak, or simply condensation

• Black smoke usually means the engine is running a rich fuel mixture or burning oil

• Blue smoke usually means oil is burning in the engine, often because of worn seals or rings

How Much Does an Exhaust Repair Cost?

What you’ll pay depends on which part of your exhaust needs work and on your car.

Typical UK costs based on published industry estimates as of 6th October 2026. Prices are representative figures only as costs vary depending on your make and model, the parts used and your chosen garage. Enter your reg and postcode to compare local garages for your exact car.

Why Book with BookMyGarage?

• BMG-Verified garages across the UK. Local businesses that offer great value and consistently meet service standards. Look for the BMG-Verified badge to find the garages we’ve ensured meet our high standards for customer service, ratings and reliability.

• We Show the Full Picture. All up front: prices, reviews, availability and distance, so you can choose the right garage based on what matters most to you.

• Real Reviews. Genuine, verified feedback from drivers like you. Every review helps you book with confidence.

• No Upfront Payment. We won’t ask for any payment details when you book. Pay the garage directly once the work’s complete.*

• Compare & Book in Seconds. See your options side by side and choose the right garage for you. No jargon. No stress. No surprises.

• Support Local Garages. We connect drivers with quality local businesses that keep communities moving.

*Some mobile technicians (that come out to you) may require an upfront payment or commitment, please check this with them first.

These are just some of the reasons to choose BookMyGarage - enter your reg and postcode to see how we can help you make a confident, informed choice when booking your exhaust repair now.

A faulty exhaust can let harmful fumes into your car and cause an MOT failure, so it's worth getting it checked as soon as you notice a problem. We’re here to make things simple and stress-free – so you can book with confidence and look forward to the results.