Service

Technical Information

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ENU

AH01

2

AH01 - Replacing Fastening Screws For Fuel Collection Pipes (Stop-Sale Campaign)

Revision:

February 23, 2017
This revision amends AH01 as follows:
1 — The work procedure was amended, now the carrier should be removed together with the trailing
arms instead of lowering it in order to remove the screws.
2 — Scope 11 was added for cars where a replacement engine was installed but not documented. With
this scope, the engine number must be checked according to a list published via PPN to determine if the
newly installed engine is affected or not.

Model Year:

2017

Vehicle Type:

911 Carrera (991)/911 Carrera S (991)/911 Carrera 4 (991)/911 Carrera 4S (991)
911 Targa 4 (991)/911 Targa 4S (991)

Subject:

Fastening screws for fuel collection pipes

Concern:

There is a possibility that the fastening screws for the fuel collection pipes on the affected
vehicles can shear off due to stress corrosion cracking.
If this happens, the high fuel pressure that builds up in the fuel injection system when the engine is running
can press the relevant fuel collection pipe off the fuel injectors. This can cause a fuel leak in the engine
compartment.

Remedial
action:

Replace fastening screws for both fuel collection pipes.
Information
Vehicles with replacement engine installed
On vehicles in which a replacement engine was installed and the relevant engine number was not
documented, we cannot be sure that the correct fastening screws were used. These vehicles are also
assigned to Scope 11.
The engine number on the vehicles must first be checked. The fastening screws may or may not have to
be replaced, depending on the result of the check.
For instructions and further information, see  Technical Information 'AH0100 Scope 11 - Checking
engine number'.
To find out which campaign scope is assigned to the respective vehicle for this campaign, see PIWIS
Vehicle Information.

Parts Info:

NOTE: NECESSARY PARTS FOR THIS CAMPAIGN ARE STILL BEING MANUFACTURED AND ARE
EXPECTED TO ARRIVE CW07. ONCE THE REQUIRED PARTS FOR THIS CAMPAIGN HAVE ARRIVED, PCNA

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WILL BEGIN THE AUTOMATIC ALLOCATION PROCESS FOR UP TO 50% OF THE VEHICLES THAT ARE
SERVICED AT YOUR DEALERSHIP. APPROXIMATELY 45 DAYS AFTER YOUR FIRST ALLOCATION, YOUR
DEALER WILL AUTOMATICALLY BE ALLOCATED AN ADDITIONAL 30% OF THE REQUIRED PARTS FOR THE
VEHICLES THAT ARE STILL IN NEED OF REPAIR.
Installation
position:

Installation position overview
1
2

– Fuel collection pipe
– Fastening screws (replace)

Affected
Vehicles:

Only the vehicles assigned to the campaign (see also PIWIS Vehicle information). This campaign affects
4,518 vehicles in North America.

Required parts and materials
Part No.:

Feb 7, 2017
Page 2 of 23

Part No.

Designation
– Use

Qty.

000 043 306 00

 Torx screw, BM 6 x 85
– Fuel collection pipe

4 ea.

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Service

Technical Information

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ENU

999 072 875 01

 Hexagon-head bolt, M12 x 1.5 x 95
– Rear axle carrier, outer

2 ea.

999 072 931 01

 Hexagon-head bolt, M12 x 1.5 x 110
– Rear axle carrier, inner

2 ea.

999 072 930 01

 Hexagon-head bolt, M12 x 1.5 x 105
– Lower trailing arm to wheel carrier

2 ea.

999 084 445 01

 Lock nut, M12 x 1.5
– Lower trailing arm to wheel carrier

2 ea.

999 072 869 01

 Hexagon-head bolt, M12 x 1.5 x 45
– Rear diagonal brace

2 ea.

999 073 443 01

 Combination screw, M12 x 1.5 x 40
– Front diagonal brace

2 ea.

N 908 484 05

 Hexagon nut, M12 x 1.5
– Engine carrier to engine mount

2 ea.

999 512 707 00

 Hose clamp, 9.6 - 11.3 mm
– Vacuum lines

4 ea.

999 512 498 00

 Hose clamp, 13.1 - 15.3 mm
– Vacuum lines

2 ea.

AH01

2

Also required for vehicles without PASM/PDCC:
999 084 123 09

 Hexagon nut, M10
– Anti-roll bar to connecting link

2 ea.

Also required for vehicles with PASM/PDCC (I-no. 031/352):
999 084 132 01

Materials:

 Hexagon nut, M12
– Anti-roll bar to actuator

2 ea.

Material required only for vehicles with body shape Targa:
Part No.

Designation
– Use

Qty.

...

Tie-wrap*
approx. 4.0 mm wide, approx. 200 mm long
e.g. Part No. 999 513 076 40
– Convertible-top service position

2 ea. *

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* The WWS Warranty system will automatically add into the “Miscellaneous item” section (sublet) of the
claim after the claim has been submitted..

Required tools
Tools:

•
•
•
•
•
•
•
•
•
•

Torque screwdriver, 1.5 - 3 Nm (1 - 2 ftlb.), e.g. VAS 6494 - Torque screwdriver
Torque wrench, 2 - 10 Nm (1.5 - 7.5 ftlb.), e.g. V.A.G 1783 - Torque wrench, 2-10 Nm (1.5-7.5
ftlb.)
Torque wrench, 6 - 50 Nm (4.5 - 37 ftlb.), e.g. V.A.G 1331 - Torque wrench, 6-50 Nm (4.5-37
ftlb.)
Torque wrench, 40 - 200 Nm (30 - 148 ftlb.), e.g. V.A.G 1332 - Torque wrench, 40-200 Nm
(30-148 ftlb.)
Torque/torque angle screw tool, 20 - 400 Nm (15 - 296 ftlb.), e.g. VAS 6942 - Torque/torque
angle screw tool
Hydraulic transmission jack, e.g. V.A.G 1383 A - Engine/gearbox jack
Suitable engine support, e.g. 9769 - retainer plate
Suitable hose clip pliers, e.g. V.A.G 1275A - Hose clip pliers
Battery Charger/Power Supply - Suitable for AGM Type batteries, recommended current rating of
70A fixed voltage 13.5V to 14.5V.
9900 - PIWIS Tester 3

Additional tools required for vehicles with Lane Change Assist (I-no. 457) or ParkAssist with
reversing camera (I-no. 638):
•
•
•

VAS 6350A - Calibration unit
VAS 6350/2 - Spacing laser
VAS 6350/4 - Calibration Unit for Lane Change Assist

Preparatory work
Work Procedure: 1

Raise the vehicle on a lifting platform  Workshop Manual '4X00IN Lifting the vehicle'.

2

For Cabriolet/Targa vehicles:
Move convertible top into service position.
 Workshop Manual '6101IN Convertible top service position (Cabriolet)'
 Workshop Manual '6101IN05 Convertible top service position'

3

Relieve fuel pressure in the system.
3.1

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Remove cover on the fuse carrier in the passenger compartment at the front left.

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Technical Information
3.2

13/17

ENU

AH01

2

Pull out fuse for fuel pump.
The fuse (20 A) is in row B  Fuse carrier
in passenger compartment at the front left
-1-, slot FB5  Fuse carrier in passenger
compartment at the front left -2-.

Fuse carrier in passenger
compartment at the front left
WARNING
Exhaust gases
•

Risk of Carbon Monoxide (CO) Poisoning



Before starting the engine, position an exhaust extraction system behind the vehicle’s exhaust
pipes and switch it on.
3.3

Start the engine and leave it running at idle speed until it cuts out.
This can take up to 5 minutes.

3.4

Switch off ignition and remove ignition key.

3.5

Re-insert fuse for fuel pump.

4

Disconnect ground line at the battery  Workshop Manual '2X00IN Work instructions after disconnecting the battery'.

5

Remove engine-compartment blower  Workshop Manual '198119 Removing and installing enginecompartment blower'.

6

Remove both tail lights  Workshop Manual '943119 Removing and installing tail lights'.

7

Remove rear apron  Workshop Manual '635519 Removing and installing rear apron'.

8

Remove rear spoiler  Workshop Manual '66581905 Removing and installing rear spoiler'.

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Technical Information

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Remove air guide for charge-air cooling  Workshop Manual '211019 Removing and installing air
guide for charge-air cooling'.

10 Remove pressure pipe at the left and right  Workshop Manual '214119 Removing and installing
pressure pipe'.
11 Remove air cleaner housing  Workshop Manual '242519 Removing and installing air cleaner
housing'.
12 Remove retaining frame for charge-air cooler at the left and right  Workshop Manual '261519
Removing and installing retaining frame for charge-air cooler and heat shield'.
13 For Cabriolet/Targa vehicles:
Remove support plate on the rear axle.
13.1

Remove rear underbody cover  Workshop Manual '519419 Removing and installing cover
for rear underbody'.

13.2

Remove support plate  Workshop Manual '421419 Removing and installing support plate'.

14 Remove both diagonal braces on the rear axle  Workshop Manual '421319 Removing and
installing strut'.

Replacing fastening screws for fuel collection pipes
Work Procedure: 1

Remove rear axle carrier together with the lower trailing arms  Workshop Manual '420619
Removing and installing rear-axle cross member'
Information

2

•

The weight must be distributed uniformly on the oil pan.

•

Never apply localized pressure to the oil pan.

Slowly lower the engine until the gap between the
rear silencer  Required gap between rear silencer
and heat shield -1- and heat shield  Required gap
between rear silencer and heat shield -2- is about
100 mm  Required gap between rear silencer and
heat shield -dimension X-.
For instructions, see  Workshop Manual '100109
Lowering the engine'.

Required gap between rear
silencer and heat shield

Feb 7, 2017
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Service

Technical Information
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13/17

ENU

AH01

2

Replace fastening screws for fuel collection pipes.
3.1

Loosen and unscrew front fastening screw

 Replacing fastening screws -2- (viewed in
direction of travel) for fuel collection pipe on
cylinder 1–3  Replacing fastening screws
-1-.