Exhaust System - Underbody Humming/Rattling Noises
26 A4/A5 - noises from rear silencer
26 12 12
2027945/2
August 16, 2012.
Supersedes Technical Service Bulletin Group 26 number 11 - 07 dated November 4, 2011 for reasons listed below.
Affected Vehicles
54
Condition
Humming or metallic rattling noise from under the vehicle, most consistently heard during engine idle or slow acceleration. Initial inspection
indicates the noise is coming from the exhaust system.
Technical Background
Relative movements in the rear mounting of the exhaust system (rear silencer).
Production Solution
Not applicable.
Service
If the complaint clearly occurs in the portion of the exhaust shown below, reduce the tension on the exhaust system:
1. Loosen the mount (Figure 1, A) at the rear of the exhaust system.
2. Tighten the mount (Figure 1, A) while pressing it together with a pair of pliers (Figure 1, B).
55
Warranty
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
