1. Coolant leaking into the combustion chamber: This can happen if the head gasket is blown or there is a crack in the cylinder head.
2. Faulty fuel injector: A faulty fuel injector can cause too much fuel to be injected into the engine, which can lead to incomplete combustion and white smoke.
3. Worn piston rings: Worn piston rings can allow oil to leak into the combustion chamber, which can also lead to incomplete combustion and white smoke.
If you're seeing white smoke coming from your exhaust, it's important to have the vehicle inspected by a mechanic to determine the cause and correct it as soon as possible.