A8 Quattro Sedan V8-4.2L (AUX) (2001)
Check the braided vacuum hose (Figure 2, Point 1) and the secondary air combi valve (Figure 2, Point 2).
1.
Replace braided hose with Part No. 077 145 718B on both cylinder heads.
For Secondary air injection hose overview, see Repair Manual >> Engine Mechanical >> Repair Group 26, Exhaust system emission controls >>
Secondary air system components, removing and installing.
2.
Reinstall upper engine covers.
3.
Erase any stored DTCs using a VAS diagnostic tool.
4.
Set readiness code.
Warranty
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.