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What may happen if the exhaust system is not working properly?

A Poisonous fumes may enter the cab
Explaination
A broken exhaust system can allow poisonous fumes to enter a vehicle's cab or sleeper berth. Be sure to regularly check your exhaust system for defects.
B Poisonous fumes may exit the rear of the muffler system
C It may prevent proper steering
D It may cause problems if the trailer is fully loaded