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For more on marking an answer as the "Best Answer", please visit our FAQ.Obviously, exhaust fumes should leave the engine, pass through the exhaust system and be emitted at the rear of the vehicle. If fumes are entering through the ventilators then you have a leak at the front, most likely at the manifold, as the car is virtually 'new' it won't have a hole in the exhaust pipes. Run the engine with the bonnet open and see if you can hear of feel any gasses escaping around the manifold (where the exhaust comes out of the engine block). It might be a matter of simply tightening the bolts, I suggest you pop along to Kwik-Fit, if there are no parts involved they probably won't even charge.
I had the same problem on a 5 sreies BMW, fumes coming in through the heater ? AC vents. These come not from the exhause system although they do smell a bit carbon monoxide-ish, but from the top of the enhine via, the valve system as someon earlier mentioned. They are not exhause fumes as we know them. Get the dealer to check the top end of the engine
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