TorqFix

Removing and installing parts of injection system for ARZ, AUM, AUQ engines — VW

Removing and installing parts of injection system for ARZ, AUM, AUQ engines on VW: factory workshop procedure for engines AGN, AGU, AQA, ARZ.

Workshop procedure for VW — the factory write-up, straight from real workshop data.

factory workshop text 6 engine codes

🔧 Engine codes this applies to

📋 Procedure

ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.

Removing and installing parts of injection system for ARZ, AUM, AUQ engines
Removing and installing parts of the injection system for AGN engine
Chapter
.
Removing and installing parts of the injection system for AGU engine
Chapter
.
Removing and installing parts of the injection system for AQA engine
Chapter
.
Air cleaner
Dismantling and assembling
Chapter
.
10 Nm
6 Nm
Vacuum union
To intake manifold.
40-pin connector
Only disconnect or connect with ignition switched off.
Release to disconnect.
81-pin connector
Only disconnect or connect with ignition switched off.
Release to disconnect.
Motronic control unit
J220
Location: in plenum chamber.
4-pin connector
For
Lambda probe after catalytic converter
G130
and
Lambda probe heating
Z19
, brown.
Right on underside of vehicle.
Connector
Black for
Lambda probe
G39
and
Lambda probe heating
Z19
.
Right on underside of vehicle.
6-pin
Engine code ARZ
4-pin
Lambda probe
G39
, 50 Nm
Location: in front exhaust pipe.
Grease threads only with
hot bolt paste
G 052 112 A3
,
hot bolt paste
G 052 112 A3
must not get into the slots of probe body.
Lambda probe after catalytic converter
G130
, 50 Nm
Location: in rear of catalytic converter
Grease threads only with
hot bolt paste
G 052 112 A3
,
hot bolt paste
G 052 112 A3
must not get into the slots of probe body.
Bracket
10 Nm
10 Nm
Engine speed sender
G28
3-pin connector
Grey
For
engine speed sender
G28
.
Location
Chapter
.
O-ring
Renew if damaged.
20 Nm
45 Nm
Support
Between intake manifold and engine block.
6 Nm
Charge air pressure sender
G31
Intake manifold
Gasket
Renew.
From
active charcoal filter system solenoid valve 1
N80
Throttle valve module
J338
Return line
Secure with spring-type clips.
Check for secure seating.
To fuel delivery unit in fuel tank.
Supply line
Secure with spring-type clips.
From fuel filter.
10 Nm
Fuel rail with injectors
Dismantling and assembling
Chapter
.
Intake air temperature sender
G42
To pipe between turbocharger and charge air cooler
To pipe between turbocharger and charge air cooler
To turbocharger
From crankcase breather
Coolant temperature sender
G62
For engine control unit.
With
coolant temperature gauge sender
G2
.
If necessary, release pressure in cooling system before removing.
Connector
Black, 4-pin.
For
coolant temperature sender
G62
.
Securing clip
Check for secure seating.
To
turbocharger divert air valve
N249
Item
To pressure actuator on turbocharger
Charge pressure control solenoid valve
N75
Intake hose
Air mass meter
G70
5-pin connector.

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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.

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Workshop data on this page last updated 20 Sep 2026.