If a Volkswagen car has a full system exhaust problem, the risks can be quite serious. A full system exhaust problem can lead to a rise in the levels of carbon monoxide and other dangerous gases inside the car. Carbon monoxide can be lethal if exposed to in high levels, and this can lead to confusion, dizziness, nausea and even loss of consciousness. It can also cause damage to your car engine and catalytic converter. The carbon monoxide can enter the cabin of the car, leading to a potential increase in the risk of carbon monoxide poisoning. If you drive with a full system exhaust problem, it can also increase pollutants in the environment.