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If you mean diesel exhaust does the smell subside when you put it on the recirculate mode? Also, if the exhaust leak is under the cab you might still smell this since vehicles are not completely sealed.
I can smell exhaust any time the windows are down and if it's windy and it's blown back towards the cab.
The worst case is that there is an exhaust leak and exhaust is not just being omitted at the tail pipe but in other places. I believe another cause could be an engine problem that causes more exhaust than you should be getting but you'll need a diesel mechanic to explain that one.
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