Why does noise help identify the fault?

Different faults produce sounds with distinctive patterns — when the noise happens, where it seems to come from, and whether it changes with speed, steering or braking all point to different components. A noise on turns suggests the front drivetrain. A noise that changes with speed suggests something rotating. A noise only when braking points to the brakes. Combining the sound with when it happens narrows the possibilities significantly.

Car noise guides

What's that noise?

Q: How much do common car noise repairs cost in the UK?

Costs vary widely. A loose heat shield or exhaust mount can be under £100. Brake pad replacement is typically £100 to £300. A CV joint or wheel bearing is usually £150 to £500. Clutch replacement runs £500 to £1,000. Engine or gearbox work is the most expensive, often £600 or more. The vehicle make, model and which garage you use all affect the final figure significantly.

Something's making a sound it shouldn't. Plain-English guides to the most common car noises — what's causing them, whether they're safe to drive on, and what they typically cost to fix at a UK garage.

The noise itself matters, but when it happens narrows things down dramatically. A squeal when braking and a squeal on startup are two completely different problems. Use the guides below by what you're hearing and when — or use the section below to find your noise by when it happens.

Braking Squealing brakes Worn pads, glazing, rust or dust - how to tell which one, and what it costs to fix. Braking Grinding brakes Usually means pads are worn through to metal. Here's why it matters and what to expect. Drivetrain Clicking when turning CV joint wear is the most common cause - here's how to be sure. Drivetrain Grinding gears Clutch, synchro or gearbox wear - what each sounds like and costs. Wheels Humming from a wheel Usually a wheel bearing - here's how it progresses if left. Exhaust Rattling underneath Loose heat shields and exhaust mounts are the usual culprits. Suspension Knocking over bumps Suspension links and bushes wear out - here's what to check. Engine Squealing on startup A worn drive belt is almost always the cause - here's how to tell. Engine Clunk when pulling away Usually a worn engine or gearbox mount - here's why it happens.

Find your noise by when it happens

When braking

Squealing brakes — worn pads or glazing
Grinding brakes — pads worn through to metal

At speed (constant)

Humming from a wheel — wheel bearing
Rattling underneath — exhaust or heat shield

When turning

Clicking when turning — CV joint wear
Hum that changes on corners — wheel bearing

Over bumps or rough road

Knocking over bumps — suspension links or bushes
Rattling underneath — loose exhaust components

On startup or from engine bay

Squealing on startup — drive belt

When pulling away or on throttle

Clunk when pulling away — engine or gearbox mount
Grinding when changing gear — clutch or synchromesh

Is it safe to drive?

These go deeper on how urgent a noise usually is, and why. A mechanic who can inspect your car is always the one who can actually confirm that — these explain what mechanics generally look for.

Brakes

Wheels and suspension

Steering and drivetrain

Is clicking when turning safe to drive on?

Which car noises are serious?

Grinding brakes, a loud knocking from the engine, or any noise that comes alongside reduced braking, steering, or engine performance should be treated as urgent. Squealing brakes, a light rattle underneath, or a humming wheel are less immediately dangerous but indicate a component that's wearing and will worsen if left.

Do car noises fail an MOT?

Not directly — MOT testers assess the condition of components, not the presence of noise. But most noises are caused by a failing or worn part, and many of those parts are MOT items. A grinding brake, worn CV joint, or heavily corroded exhaust are all common MOT failures. Addressing a noise usually means addressing whatever is causing the MOT failure too.

How much do common car noise repairs cost in the UK?

Costs vary widely by car and garage. A loose heat shield can be under £100. Brake pad replacement is typically £100 to £300. A CV joint or wheel bearing is usually £150 to £500. Clutch replacement runs £500 to £1,000. Engine or gearbox work is usually £600 or more. Each guide above gives typical UK price ranges for that specific fault.

Why does when the noise happens matter so much?

Different faults produce sounds with distinctive patterns. A noise only on turns suggests the front drivetrain. A noise that changes with speed suggests something rotating. A noise only when braking points to the brakes. Combining the sound type with when it happens narrows the field from dozens of possible faults to two or three — which is exactly how mechanics approach it too.

These guides are for general information only and aren't a substitute for a qualified mechanic's inspection. Car noises can have multiple causes, some more serious than others, and the only way to be certain is to have the car physically examined. If any noise is accompanied by reduced braking, steering, or control, stop driving and arrange an inspection.

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