Removing and installing turbocharger, engine codes 1Z, AFF, AHU — AUDI
Removing and installing turbocharger, engine codes 1Z, AFF, AHU on Audi: factory workshop procedure for engines 1Z, AFF, AFN, AHH.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
AFF AFN AHH AHU AVG
Removing
Release quick release fasteners -A- and -B- and take off front noise insulation.
Vehicles with air conditioner:
Note:
Mark direction of rotation of belt with chalk or felt pen before removing ribbed belt. If the belt rotates in the wrong direction when it is refitted, this can cause breakage.
Loosen bolts securing ribbed belt tensioner for A/C compressor -arrows-. Slacken belt and remove.
Detach A/C compressor from bracket and secure to body with wire.
Important:
The air conditioner refrigerant circuit must not be opened.
All models:
Remove right air intake hose -arrows-.
Remove oil return pipe from cylinder block -arrows-.
Loosen bolts for turbocharger -arrows-. Leave the two front bolts loosely in place.
Remove engine cover panel -arrows-.
Remove air intake duct to air cleaner.
Disconnect hose -3- from air cleaner housing.
Unplug connector -1- at air mass meter.
Remove wiring harness from air filter housing -arrow-.
Remove air intake hose -4-.
Unscrew bolt -2-.
Take off air filter housing.
Detach air intake from front of turbocharger.
Detach oil feed line -1- at turbocharger.
Disconnect hose -2- at pressure unit for boost pressure control.
Disconnect hose -3- from turbocharger.
Unscrew turbocharger/catalytic converter nuts-arrows-.
Completely remove turbocharger/exhaust manifold bolts and detach turbocharger.
Installing
Installation is carried out in the reverse order, when doing this note the following:
Notes:
Fill turbocharger with engine oil via oil supply connection.
Secure all hose connections with the correct hose clips (same as original equipment):
=> Parts List
Always replace seals, gaskets and self-locking nuts.
Charge air system must be free of leaks.
After installing turbocharger, run engine for approx. 1 minute at idling speed; do not rev. up immediately. This ensures the turbocharger is properly lubricated.
Check oil level => Page
17-29
.
Tightening torques
Component · Nm
Turbocharger to exhaust manifold · 30
Turbocharger to catalytic converter · 25
Oil return line to cylinder block · 30
Oil supply pipe to turbocharger · 25
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.