You can get carbon monoxide (CO) poisoning in a car primarily by running the engine in an enclosed or poorly ventilated space, allowing the odorless, colorless gas—a byproduct of combustion—to seep into the cabin. This most frequently occurs due to a damaged exhaust system, a blocked tailpipe, or simply idling the car in a garage, even with the door open.
A compromised exhaust system is a major risk. Rust holes, cracks in the exhaust manifold, or a leaking muffler can allow CO to enter through the car's floorboards or rear hatch before it ever reaches the tailpipe. Similarly, if your tailpipe is blocked by snow, mud, or debris, the toxic gas can be forced back underneath the vehicle and into the passenger compartment through fresh air vents.
Many cases happen when people use a car for warmth or power. Idling a car in an attached garage is extremely dangerous, as CO can quickly infiltrate your home. Modern, well-sealed vehicles are not immune; driving with a trunk or rear hatch open can also pull exhaust fumes forward into the cabin. Recognizing the symptoms is critical, as they are often mistaken for the flu: headache, dizziness, nausea, and confusion.
| Common Scenarios Leading to CO Poisoning | Key Risk Factors & Prevention Tips |
|---|
| Idling in a closed garage | Never start a car in a closed garage. Open the door first, and pull out immediately. |
| Faulty exhaust system | Get regular inspections for cracks, holes, or rust in the exhaust system. |
| Blocked tailpipe (snow, mud) | Clear the tailpipe area after driving in deep snow or off-road. |
| Using a car for heat/power | Avoid using the car as a generator or heater while stationary for long periods. |
| Driving with open rear hatch | Be aware that an open hatch or malfunctioning rear window seal can draw in fumes. |
| Vehicle malfunctions (e.g., faulty cabin seal) | Address any unusual smells or changes in cabin air quality promptly. |
The most reliable prevention is proper ventilation and regular vehicle maintenance. Always ensure your exhaust system is intact and be hyper-aware of your surroundings when the engine is running. Installing a carbon monoxide detector in your home and garage provides an essential early warning.
