Final answer:
The presence of white smoke on vehicle exhaust can be caused by a coolant leak or the burning of excess fuel. It is recommended to consult a mechanic for proper diagnosis and repairs.
Step-by-step explanation:
White smoke coming out of a vehicle's exhaust is often an indication of a coolant leak. When coolant enters the combustion chamber, it gets vaporized and comes out as white smoke. This could be caused by a faulty head gasket, cracked cylinder head, or a damaged engine block.
Another possible cause of white smoke is the burning of excess fuel. If the air-fuel mixture is not properly balanced and there is too much fuel, it can create white smoke in the exhaust. This can happen due to issues with the fuel injectors, airflow sensor, or engine timing.
It is important to have a qualified mechanic diagnose the exact cause of the white smoke to determine the appropriate repairs.