Removing and installing parts of the injection system for AGN engine — VW
Removing and installing parts of the injection system for AGN engine on VW: factory workshop procedure for engines AGN, AGU, AQA, ARZ.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📋 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 the injection system for AGN engine
Removing and installing parts of the injection system for ARZ, AUM, AUQ engines
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
.
Air mass meter
G70
with
intake air temperature sender
G42
10 Nm
6 Nm
28-pin connector
Only disconnect or connect with ignition switched off.
Release to disconnect.
52-pin connector
Only disconnect or connect with ignition switched off.
Release to disconnect.
Motronic control unit
J220
Location: in plenum chamber.
10 Nm
Engine speed sender
G28
3-pin connector
Grey
For
engine speed sender
G28
.
Location
Chapter
.
O-ring
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.
Probe heating voltage supply via
fuel pump relay
J17
.
Check probe heating for continuity.
Location
Chapter
.
4-pin connector
Black.
For
Lambda probe
G39
and
Lambda probe heating
Z19
.
Location
Chapter
.
Connector
Black, 2-pin.
For
camshaft adjustment valve 1
N205
.
Inlet camshaft control valve 1
N205
Seal
With locating tab.
Renew if damaged.
Connector
Black, 2-pin.
For
injector, cylinder 1
N30
to
injector, cylinder 4
N33
.
Fuel rail with injectors
Dismantling and assembling
Chapter
.
Intake manifold
Dismantling and assembling intake manifold upper part
Chapter
.
Dismantling and assembling intake manifold lower part
Chapter
.
10 Nm
Connector
Black, 2-pin.
For
variable intake manifold change-over valve
N156
.
Connector
For
throttle valve control module
J338
.
Variable intake manifold change-over valve
N156
Checking intake manifold change-over
Chapter
.
Resistance: 25...35 Ω.
Throttle valve module
J338
Vacuum actuator
10 Nm
Securing clip
Check for secure seating.
O-ring
Renew if damaged.
Coolant temperature sender
G62
Blue
For
Motronic control unit
J220
.
With
coolant temperature gauge sender
G2
.
If necessary, release pressure in cooling system before removing.
Connector
Blue, 4 pin
For
coolant temperature sender
G62
.
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.
Ask about my car →Other VW procedures
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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.