Removing and installing front exhaust pipe (left-side) with starter catalytic converter — AUDI
Removing and installing front exhaust pipe (left-side) with starter catalytic converter on Audi: 13 steps, engines ASE.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A8 D3 (4E, 2002–2010)
- Renewed: self-locking nuts
Don't miss
- Renew self-locking nuts.
- Only tighten bolts for subframe to the specified torque (do not turn further); tighten bolts only after performing alignment check Running gear, front-wheel and four-wheel drive40.
- The vehicle must not be driven at this stage. — Install anti-roll bar Running gear, front-wheel drive and four-wheel drive40.
🔧 Engine codes this applies to
📋 Procedure
- Lower subframe .
- Remove main catalytic converter (left-side) .
- Remove heat shield panels for drive shaft (left-side) (arrows).
- Unbolt bracket for front exhaust pipe (arrows).
- Unscrew nuts (arrows) at front exhaust pipe/turbocharger.
- Remove front exhaust pipe (left-side). [Note: Renew self-locking nuts.]
- Note installation position of individual mounting components (left-side).
- Only tighten bolts for subframe to the specified torque (do not turn further); tighten bolts only after performing alignment check Running gear, front-wheel and four-wheel drive40.
- ⚠ The vehicle must not be driven at this stage. — Install anti-roll bar Running gear, front-wheel drive and four-wheel drive40.
- Install the main catalytic converter (left-side) .
- Align exhaust system so it is free of stress .
- Deactivate jacking mode Running gear, front-wheel drive and four-wheel drive43Operating the air suspension.
- Perform wheel alignment check Running gear, front-wheel drive and four-wheel drive44.
Other AUDI procedures
- Removing and installing toothed belt for high-pressure pump · 3 torque figures
- Removing and installing exhaust manifold (left-side) – Audi · 4 torque figures
- Removing and installing sump (centre section) – Audi A8 D3 · 2 torque figures
- Removing and installing exhaust gas temperature sender 1G235 · 1 torque figures
- Removing and installing drive chain for valve gear – Audi · 1 torque figures
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.