If you smell exhaust fumes inside your car, it indicates that harmful gases are leaking into the cabin instead of being expelled through the exhaust system. Exhaust fumes contain carbon monoxide, which is extremely dangerous. An inspection should be carried out immediately to identify and repair the source of the leak.

What does it mean if you smell exhaust fumes in the car?

Exhaust odour in the cabin usually means there is a leak in the exhaust system, often before the catalytic converter or muffler. It can also enter the car if there are gaps in door seals, floor panels, or the firewall.

Common causes of exhaust fumes inside the car

• Leaking exhaust manifold or gasket
• Cracked or corroded exhaust pipe
• Faulty catalytic converter or muffler
• Rust holes or damage under the vehicle
• Broken or loose seals around doors, windows, or boot
• Blocked cabin air filter allowing fumes inside

Why do you need to fix this problem quickly?

Exhaust fumes contain carbon monoxide, which is odourless, toxic, and potentially fatal. Even small leaks can expose passengers to dangerous gases. Immediate inspection and repair are essential for safety.

How do you know when to get it checked?

You should book an assessment if:

• You smell exhaust fumes while driving or idling
• Passengers complain of headaches, dizziness, or nausea
• You hear loud exhaust noises from under the car
• The cabin air smells unusual or “gassy”
• You see visible rust or holes in the exhaust system

What happens during an assessment?

A mechanic will:

1. Inspect the exhaust manifold, pipes, and muffler for leaks
2. Check gaskets and joints for cracks or corrosion
3. Examine seals around the cabin and floor for gaps
4. Inspect and replace the cabin air filter if needed
5. Advise on necessary repairs or replacements to eliminate leaks

How much does it cost to fix?

Minor exhaust repairs such as gasket replacement may cost $150–$300. Muffler or pipe replacement typically ranges from $300–$800. Full exhaust system replacement can cost $1,000–$2,500+, depending on the vehicle.

Is it unsafe to drive with exhaust fumes in the car?

Yes. Exhaust fumes inside the cabin are extremely dangerous due to carbon monoxide exposure. Driving with this issue poses serious health risks and should be avoided until the car is repaired.