What can happen if the exhaust system is not working properly? Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question What can happen if the exhaust system is not working properly? Answers Poisonous fumes may enter the cab. Fumes may exit the rear of the muffler system. Proper steering may be impossible. Explanation Leaks in an exhaust system are extremely dangerous because they may allow toxic fumes into the cab or sleeper berth, endangering drivers and passengers. This questions appears in the following tests: Arizona Class B Knowledge Test Idaho Class B Knowledge Test Idaho Passenger Maryland Class B Knowledge Test New Hampshire Class A Knowledge Test Oklahoma Double Virginia Class A Knowledge Test Wyoming Double