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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > 335d exhaust rattle question, Flap?



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      12-23-2015, 12:09 AM   #1
Poloautoclub
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335d exhaust rattle question, Flap?

Hey guys i have a 2011 335d with 35k miles and whenever i get home from driving and turn off the car there is a rattle coming from the muffler area? Is this the exhaust flap? I heard that they could have a vacuum leak.. Is this correct? any input/help greatly appreciated
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      12-23-2015, 02:38 AM   #2
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It's your urea transfer pump. There are no flaps in the exhaust.
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      12-23-2015, 06:57 AM   #3
Mark M
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Quote:
Originally Posted by Yozh
It's your urea transfer pump. There are no flaps in the exhaust.
Correct. It's the urea pump and it is normal. They all do it. It is transferring def fluid from the passive to active tank.
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