We all experience smells in our lives, whether they’re in our homes, our offices, or even our cars. However, there are some smells that mean trouble. Check out our list of what smells those are and what they mean for you and your vehicle.

If you smell rotten eggs, it means that your catalytic converter is having trouble. This could be either a fuel injection problem or that your cat is failing because there’s hydrogen sulfide in your exhaust causing the stench. Get this repaired as soon as possible.

If you smell sulfur, it is a gear lubricant leak that should be repaired. The leak is coming from either the manual transmission, the transfer case, or the differential housing. The smell comes from a sulfur compound in the oil. Look under your car for oily puddles.

If you smell maple syrup, it is your coolant leaking. Coolant contains ethylene glycol, which smells sweet but is very toxic. This is an easy fix but should be repaired.

If you smell gas, it’s gas. Easy peasy. This means you have a leak in your fuel injection line or a fuel tank vent hose in your engine. If you have a newer car, this is a real concern.

If you smell hot oil, it’s hot oil. Another easy one, this means you have an oil leak, and the oil is dripping (or spraying) onto the exhaust manifold and burning while your engine is running. Try to find the leak and stem it but really you should take your vehicle in for service and repair as soon as possible.