S4 V8-4.2L (BHF) (2004)
Muffler: Locations
Mufflers With Mounts
1. Center muffler
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Factory-installed with rear muffler as one unit. If repair is necessary, replace separately
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Align exhaust system free of stress
2. 23 Nm
3. Support ring
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Replace if damaged
4. Oxygen sensor - 55 Nm
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Behind catalytic converter
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Bank 1, sensor 2
5. 27 Nm
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Always replace
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Tighten uniformly in several stages
6. Exhaust manifold
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Bank 1
7. Gasket
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Always replace
8. Oxygen sensor - 55 Nm
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Before catalytic converter
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Bank 1, sensor 1
9. 27 Nm
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Always replace
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Tighten uniformly in several stages
10. Exhaust manifold
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Bank 2
11. Gasket
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Always replace
12. Oxygen sensor - 55 Nm