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Subaru introduced the "New Age" Impreza to Japan in August 2000. Larger in size compared to the previous iteration, the sedan increased its width.

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Why do I have white smoke coming from the passenger side of the engine

Sometimes when I drive I see and smell white smoke coming from under the hood

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2007 BMW 650i. I have the same condition. After engine is warm very little smoke is evident. Also slightly rough idle. Replacing O2 sensors this weekend. Also replacing oil pan gasket, transmission pan while I’m under there. Tested coolant for exhaust gasses, negative. All new coils and plugs. Smoked engine for leaks, negative. Brand new battery. Replaced integrated control module. New water pump. 0 trouble codes. Mode6 readings but I can’t locate meanings. Suspect lean or too rich indicators. So I’m replacing O2 sensors.


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The causes of white exhaust smoke can vary; however, it is common to see white exhaust smoke when first starting a car, especially on cooler days. This is generally steam caused by condensation. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke.

One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear.

Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury; always allow the car to cool down completely first. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located.

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Check if your catalyst converter is still attached to your exhaust pipe just below the engine.

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My car has white smoke come out just after every start recently then goes away quick it's just when u turn the car on I got a leak from my radiator hose a tiny one


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