Servicing injection system: Audi 1.6 (ALZ, ANA, APF, AVU, …)
Step-by-step servicing injection system for the Audi 1.6: factory workshop text. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📐 32 workshop diagrams for ALZ
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.
Servicing injection system
1
Air cleaner
Dismantling and assembling
Chapter
2
6 Nm
3
10 Nm
4
3 Nm
5
Lower section of intake manifold
6
Fuel supply pipe
Secure with spring clips
From fuel filter:
Fuel Supply, Petrol Engines; Repair group 20; Fuel supply - front-wheel drive; Component overview - fuel tank with attachments
7
Fuel return pipe
Secure with spring clips
To the fuel delivery unit in the fuel tank:
Fuel Supply, Petrol Engines; Repair group 20; Fuel supply - front-wheel drive; Component overview - fuel tank with attachments
8
Fuel rail with injectors
Dismantling and assembling
Chapter
9
3-pin connector
Black
For Hall sender
G163
10
15 Nm
11
4-way connector
Black
For coolant temperature sender
G62
12
Coolant temperature sender
G62
Green
Check
If necessary, release cooling system pressure before removal
13
O-ring
Renew if damaged
14
Retaining clip
Check for firm seating
15
Seal
Renew
16
2-pin connector
For injectors
Black
17
Seal
Renew if damaged
18
2-pin connector
For intake manifold changeover valve
N156
Black
19
Cable cover strip
20
Spreader rivet
21
Upper section of intake manifold
With intake manifold changeover function
Dismantling and assembling
Chapter
22
3-pin connector
Grey
For engine speed sender
Fitting location: near dip stick
23
Engine speed sender
G28
Check
24
10 Nm
25
O-ring
Renew if damaged
26
15 Nm
27
Support
Between intake manifold and cylinder head
28
8 Nm
For securing breather connection
29
Rubber bush
30
Washer
31
8 Nm
32
To activated charcoal filter solenoid valve 1
N80
Activated charcoal filter:
Fuel Supply System - Petrol Engines; Repair group 20; Servicing activated charcoal filter components - front and four-wheel drive
33
From heater feed
34
6 pin connector
For throttle valve control unit
J338
35
To T-piece and on to coolant expansion tank
36
Gasket
Renew
37
From exhaust gas recirculation valve
38
10 Nm
39
To brake servo
40
Intake hose
With crankcase breather valve
For cold countries: crankcase breather with heating resistor
41
To breather housing
42
To exhaust gas recirculation valve
Clean-air connection (vent)
43
Intake hose
For secondary air pump
44
Air mass meter
G70
With intake air temperature sender sender
G42
Check air mass meter
Chapter
Check the intake air temperature sender
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.