Loud Roaring or Rumbling Exhaust
No Rush — Urgency 2/5You can drive, but be aware that exhaust fumes may be leaking under the car. Do not drive with windows down or the heater on fresh air mode for long periods, as fumes could enter the cabin. If you smell exhaust inside the car, get it fixed immediately. This is general guidance — exhaust fumes contain carbon monoxide, which is dangerous.
This is general guidance. Your situation may differ — when in doubt, don’t drive.
What does it sound like?
Your car suddenly sounds much louder than normal, with a deep rumbling or roaring noise, especially when you accelerate. It might sound sporty or like a tractor. The noise usually comes from underneath or behind the car.
What could be causing it?
Corrosion is the most common cause, especially in older cars or those driven in areas where roads are salted in winter. The joint between exhaust sections can also fail where the sealing gasket deteriorates.
What should I do right now?
Book a visit to an exhaust specialist or your mechanic within a week or two. Small holes can sometimes be patched, but often a section of the exhaust needs replacing. Exhaust repairs are usually not too expensive. Get it checked before your next MOT as it will likely fail.