If you notice an unusual smell inside your car, it can range from a minor inconvenience to a sign of a serious mechanical or safety issue. Some odours come from simple causes like a dirty cabin filter, while others may indicate fluid leaks, electrical problems, or exhaust fumes entering the cabin. An inspection will identify the source and ensure your vehicle is safe and comfortable to drive.

What does it mean if your car has a strange smell?

Strange odours inside your vehicle can come from the heating and cooling system, leaking fluids, mould growth, or exhaust leaks. While some smells are harmless, others may signal safety risks that need urgent repair.

Common causes of car smells

• Sweet smell: Possible coolant leak
• Burning oil smell: Engine oil leaking onto hot parts
• Fuel smell: Petrol leak in the fuel system
• Rotten egg smell: Failing catalytic converter
• Musty or mouldy smell: Dirty or damp cabin filter/air conditioning system
• Burning rubber smell: Slipping drive belt or overheated components
• Electrical burning smell: Wiring or electrical fault

Why do you need to fix this problem quickly?

Some smells point to dangerous issues such as fuel or exhaust leaks, which can be hazardous to your health and safety. Even less serious causes like mould or coolant leaks can reduce comfort and damage your car if left untreated.

How do you know when to get it checked?

You should book an inspection if:

• The smell is strong or getting worse over time
• The odour is noticeable when heating or cooling is on
• You detect a fuel, exhaust, or burning smell inside the cabin
• You experience headaches or nausea while driving (possible exhaust leak)

What happens during an assessment?

A mechanic will:

1. Ask about the type and timing of the smell
2. Inspect the cabin air filter, vents, and HVAC system
3. Check for fluid leaks (oil, coolant, fuel)
4. Inspect belts, hoses, and wiring for wear or overheating
5. Test for exhaust leaks or catalytic converter failure
6. Recommend repairs or cleaning based on the diagnosis

How much does it cost to fix?

The cost depends on the cause. Cabin filter replacement may cost $50–$150, while repairing leaks or exhaust issues can range from $200–$1,200+.

Is it unsafe to drive with a smell in the car?

Yes, in some cases. Fuel, exhaust, or electrical burning smells are serious safety risks and should be checked immediately. Even musty or mouldy odours should be addressed to maintain comfort and air quality inside the vehicle.