BMW exhaust flap

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.
Read more


Remember Me