Audi A8 2019 Service Training page 27

662_077
Rear muffler
(operates on the reflec-
tion and absorption prin-
ciple)
Note
The exhaust flap is actuated by the exhaust flap control unit via a worm gear. Because this is a "self-locking" gear, it is essen-
tial that the servomotor be removed before testing the movement of the flap.
Exhaust Door Control Unit
J883
Exhaust Door Control Unit 2
J945
Exhaust flaps
Two of the four exhaust outlets can be closed, reducing noise
as the vehicle accelerates from a stop.
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