Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSMUFFLER
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Muffler
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Muffler
Exhaust System:
Legend
1 Exhaust Manifold, Left
2 Exhaust Manifold Gaskets
3 Exhaust Manifold, Right
4 Heated Oxygen Sensors (H02S)
Bank 1
Bank 2
5 Nut
6 Front Exhaust Pipe With Three Way Catalytic Converter (TWC), Right
7 Hanger
8 Double Clamp
9 Retaining Loop
10 Center Silencer
11 Retaining Loop
12 Rear Silencer
13 TWC, Left
14 Bolt
15 Seal
16 Nut
17 Nut
18 Washer
19 Left Front Exhaust Pipe
Tightening Specifications
Heated Oxygen Sensors (HO2S) Bank 1 and Bank 2 (4)
- Tighten to: 50 Nm (37 ft. lbs.).
Nut (5)
- Tighten to: 25 Nm (18 ft. lbs.).
Double Clamp (8)
- Tighten to: 40 Nm (30 ft. lbs.).
Retaining Loop (9)
- Tighten to: 25 Nm (18 ft. lbs.).
Retaining Loop (11)
- Tighten to: 25 Nm (18 ft. lbs.).
Nut (16)
- Tighten to: 25 Nm (18 ft. lbs.).
Nut (17)
- Tighten to: 25 Nm (18 ft. lbs.).
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.