A rattling noise from the exhaust tail pipe may be noted on 2012 BMW models equipped with the N54, N54T or N55 engine. The noise can last up to 60 seconds. The cause is insufficient vacuum to hold the exhaust flap shut. Note: There will be an audible one-time click from the exhaust flap when it opens or closes, which is a normal function.
Noise reduction with combustion engines, sound simulation for hybrid and electric cars, individual sound branding – these are the tasks carried out by the innovative sound application "Active noise control" (ANC) from MANN+HUMMEL.
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