No. 179-20

Service
Technical Information
179/20 ENU
2017
2
Complaint - Check Engine Warning Light Comes On, Fault Memory Entry for Tank
Ventilation/Tank Ventilation System: Observe Specified Procedure (179/20)
Vehicle Type:
911 Carrera (991)/911 Carrera S (991)/911 Carrera GTS (991)/911 Carrera T (991)/911
Carrera Cabriolet (991)/911 Carrera S Cabriolet (991)/911 Carrera GTS Cabriolet (991)/911
Carrera 4 (991)/911 Carrera 4S (991)/911 Carrera 4 GTS (991)/911 Targa 4 (991)/911
Targa 4S (991)/911 Targa 4 GTS (991)/911 Carrera 4 Cabriolet (991)/911 Carrera 4S
Cabriolet (991)/911 Carrera 4 GTS Cabriolet (991)
Model Year:
As of 2017 up to 2018
Concerns:
Tank vent valve
Information:
The Check Engine warning light comes on in the instrument cluster. One of the following entries is stored
in the fault memory of the DME control unit:
•
•
P24D6 Tank ventilation pressure sensor - sensor fault
P04F0 Tank ventilation system - upper partial load range
This is caused by a stuck diaphragm in the check valve for the vacuum line.
Action required: Replace tank vent valve, see  Workshop Manual '202319 Removing and installing tank vent valve' and
then re-program the DME control unit.
Information
The total time required for control unit programming is approx. 10 minutes.
Required tools and parts
9900 - PIWIS Tester 3 with PIWIS Tester software version 34.700.030 (or higher) installed
Battery charger with a current rating of at least 40 A, e.g. VAS 5908 Battery charger 90A.
Tool:
•
•
Parts Info:
Part No.
9A211009503
9A700875500
99970769240
9P1129260A
Designation
– Use
 Vent line with tank vent valve
Additional parts required
 O-ring
– Venturi nozzle for tank ventilation
 O-ring
– Oil supply line for turbocharger
 Clamp
– Intake pipe on turbocharger
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Qty.
1 ea.
2 ea.
1 ea.
1 ea.
Dec 8, 2020
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2017
ENU
Technical Information
179/20
99907344301
WHT008676
PAF008735
99907293101
 Combination screw
– diagonal brace
 Hexagon-head bolt
– Diagonal brace
 Hexagon-head bolt
– Rear-axle cross member
 Hexagon-head bolt
– Rear-axle cross member
2 ea.
2 ea.
2 ea.
2 ea.
Preparatory work
NOTICE
Fault entry in the fault memory and control unit programming aborted due to low voltage.
•
Increased current draw during diagnosis or control unit programming can cause a drop in voltage, which
can result in one or more fault entries and the abortion of the diagnostic process.

Before starting control unit programming, connect a suitable battery charger with a current rating of at
least 40 A to the vehicle.
NOTICE
Control unit programming will be aborted if the WiFi connection is unstable.
•
An unstable WiFi connection can interrupt communication between the PIWIS Tester and the vehicle
communication module (VCI). As a result, control unit programming may be aborted.

During control unit programming, always connect the PIWIS Tester to the vehicle communication module
(VCI) via the USB cable.
NOTICE
Control unit programming will be aborted if the driver's key is not recognized
•
If the driver's key is not recognized in vehicles with Porsche Entry & Drive, programming cannot be started
or will be interrupted.

Switch on the ignition using the original driver’s key. To do this, replace the control unit in the ignition lock
with the original driver’s key if necessary.
Work Procedure: 1
Dec 8, 2020
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Carry out general preliminary work for control unit programming as described in  Workshop
Manual '9X00IN Basic instructions and procedure for control unit programming using the PIWIS
Tester - section on "Preliminary work"'.
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Service
Technical Information
179/20 ENU
2017
2
Re-programming DME control unit
NOTICE
Use of a PIWIS Tester software version that is older than the prescribed version
•
Measure is ineffective

Always use the prescribed version or a higher version of the PIWIS Tester software for control unit
programming and coding.
Work Procedure: 1
The basic procedure for programming a control unit is described in the Workshop Manual 
Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester - section on "Programming"'.
Specific information on control unit programming in the context of this Technical Information:
Required PIWIS Tester software version:
34.700.030 (or higher)
Type of control unit programming:
Control unit programming using the 'Automatic
programming' function of the DME control unit:
'Engine electronics (DME)' control unit –
'Coding/programming' menu – 'Automatic
programming' function.
Read and follow the information and instructions
on the PIWIS Tester during the guided programming
sequence.
During the programming sequence, the DME control
unit is re-programmed and then re-codedautomatically.
Programming sequence:
Do not interrupt programming and coding.
Once the control units have been programmed and
coded, you will be prompted to switch the ignition off
and then back on again after a certain waiting time.
Backup documentation of the new software versions is
then performed.
The programming sequence takes (approx.):
10 minutes
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Service
2017
Technical Information
179/20
ENU
Procedure in the event of abnormal termination of control unit programming:
• Switch ignition off and then on again.
• Read out and erase fault memories  Workshop
Manual '9X00IN Basic instructions and procedure
for control unit programming using the PIWIS Tester section on "Subsequent work"'.
• Repeat control unit programming by restarting
programming.
Procedure in the event of other error
messages appearing during the
programming sequence:
 Workshop Manual '9X00IN Basic instructions and
procedure for control unit programming using the
PIWIS Tester - section on "Fault finding"'.
Concluding work
Work Procedure: 1
Carry out general subsequent work for control unit programming as described in  Workshop
Manual '9X00IN Basic instructions and procedure for control unit programming using the PIWIS
Tester - section on "Subsequent work"'.
Invoicing
Invoicing:
For documentation and warranty invoicing, enter the labor operations, PQIS coding and part numbers
specified below in the warranty claim:
APOS
Labor operation
20235500
Replacing tank vent valve
I No.
PQIS coding:
Location (FES5)
20170
Purge-air line
Damage type (SA4)
1616
Reacts too slowly
Parts Info:
Part No.
9A211009503
9A700875500
99970769240
9P1129260A
99907344301
Dec 8, 2020
Page 4 of 5
Designation
– Use
Vent line with tank vent valve
Additional parts required
O-ring
– Venturi nozzle for tank ventilation
O-ring
– Oil supply line for turbocharger
Clamp
– Intake pipe on turbocharger
Combination screw
– diagonal brace
AfterSales
Qty.
1 ea.
2 ea.
1 ea.
1 ea.
2 ea.
Service
Technical Information
WHT008676
PAF008735
99907293101
References:
179/20 ENU
Hexagon-head bolt
– Diagonal brace
Hexagon-head bolt
– Rear-axle cross member
Hexagon-head bolt
– Rear-axle cross member
2017
2
2 ea.
2 ea.
2 ea.
 Workshop Manual '202319 Removing and installing tank vent valve'
 Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester'
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a
discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.
© 2020 Porsche Cars North America, Inc.
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