Squeal from the engine bay
A squeal on start-up or when turning the steering is often a worn or loose drive belt. Squealing when braking is covered in the brakes guide.
Clunk over bumps
Clunks over bumps or speed humps usually point to suspension parts: sway bar links, bushes, ball joints or strut mounts.
Hum or drone that rises with speed
A hum that gets louder with road speed, and may change when you turn, is commonly a wheel bearing. It can also be tyre noise.
Knocking from the engine
A knock that rises with engine speed can be serious. Check the oil level and do not keep driving if the oil light is on.
Recording it helps
A short phone video with sound, taken safely, is useful to attach to the job.
Safe to drive?
Engine knock, oil warning or grinding brakes: stop driving. Most suspension clunks and bearing hums: drive gently and book in soon.
General guidance only, not a diagnosis. If in doubt, do not drive it and have it inspected. In an emergency, call 111.
Who can help
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Questions
How do I describe the noise?
What it sounds like, where it seems to come from, and when: cold start, braking, turning, over bumps, at a certain speed.
Can a mobile mechanic diagnose a noise?
Often yes, with a road test. Profiles show who works mobile.