Vehicles with front-wheel drive and two catalytic converters - Automatic gearbox 01K — AUDI
Vehicles with front-wheel drive and two catalytic converters - Automatic gearbox 01K on Audi: factory workshop procedure for engines AAH, ABC, ACZ, AEJ.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📐 38 workshop diagrams for AAH
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.
ABC ACZ AEJ
25 Nm
Replace
Retainer
Replace if damaged
Bending over securing tabs => Fig.
26-22
Centre silencer
Installing stress-free =>Page
26-24
25 Nm
25 Nm
Replace
Right front exhaust pipe
With catalytic converter
Protect from damage by knocks and impacts
Installing stress-free =>Page
26-24
Components of mounting for vehicles with automatic gearbox 01K =>Fig.
26-9
30 Nm
Replace
Observe the tightening sequence =>Page
26-24
Exhaust manifold
Removing and installing left exhaust manifold => Page
26-54
Removing and installing right exhaust manifold => Page
26-61
25 Nm
Replace
Gasket
Replace
Installation position: connecting piece points downwards
Lambda probe - 55 Nm
Grease only the threads with high-temperature lubricant. The lubricant must not penetrate into the slots on the probe body.
High-temperature lubricant
=> Parts List
Checking:
=> Fuel Injection and Ignition System; Repair group 24
Fuel Injection and Ignition System
Left front exhaust pipe
With catalytic converter
Protect from damage by knocks and impacts
Installing stress-free =>Page
26-24
Components of mounting for vehicles with automatic gearbox 01K =>Fig.
26-9
25 Nm
Sealing ring
Sensitive to impact; take care not to drop
25 Nm
Sealing ring
Sensitive to impact; take care not to drop
25 Nm
Replace
Retaining ring
Replace if damaged
Bending over securing tabs => Fig.
3
Rear silencer
Installing stress-free =>Page
26-24
Sealing ring
Sensitive to impact; take care not to drop
Fig.1
Components of front mounting for catalytic converter
1 -
Catalytic converter
2 -
Combi bolt
3 -
Bolt
4 -
Buffer
5 -
Link
6 -
Tubular spacer
7 -
Nut, self-locking - 25 Nm
8 -
Spacer
9 -
Plate
10 -
Nut, self-locking - 25 Nm
11 -
Bolt
12 -
Pressure spring
Fig.2
Bending over securing tabs on brackets of front mounting
Centre and rear silencer
After installing the exhaust system, bend over the securing tabs -arrows- approx. 90°.
Ensure that a distance corresponding to dimension -a- is maintained between retainer and securing tab.
Dimension a = 2 mm
Fig.3
Bend over securing tabs on brackets of rear mounting
Rear silencer
After installing the exhaust system, bend over the securing tabs -arrows- approx. 90°.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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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.