Service

Technical Information

04/24

ENU

WPS1

8

WPS1 - Checking Pressure Sensors and Replacing them if Necessary (Workshop
Campaign)
Important:

CRITICAL WARNING -This campaign includes steps where control unit(s) in the vehicle will be
programmed with the PIWIS Tester. The vehicle voltage must be maintained between 13.5 volts and 14.5
volts during this programming. Failure to maintain this voltage could result in damaged control unit(s).
Damage caused by inadequate voltage during programming is not a warrantable defect. The technician
must verify the actual vehicle voltage in the PIWIS Tester before starting the campaign and also document
the actual voltage on the repair order.
Change overview:
Release

Date

Change

1

07/26/2024

•

First publication

2

08/10/2024

•

Update of TUs

Model Year:

As of 2020 up to 2023

Vehicle Type:

Panamera 4 E-Hybrid (971) / Panamera 4S E-Hybrid (971)

Concerns:

Air conditioning system pressure sensors

Cause:

Due to a manufacturing error at the supplier, pressure sensors for the refrigerant circuit that
do not meet the required specifications were installed in the affected vehicles.
The failure of one or both pressure sensors in the refrigerant circuit therefore cannot be ruled out over
the lifetime of the vehicle. As a result, there is a possibility that the air conditioning and battery cooling
system are not functioning properly.
This can lead to an increased temperature of the high-voltage battery.

Action:

Check pressure sensors and replace them if necessary.

Affected
Vehicles:

Only vehicles assigned to the campaign (see also PCSS Vehicle Information).

AfterSales

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Technical Information

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Installation
Position:

Installation position of pressure sensors
1
2

– Pressure sensor (PT1) on low-pressure side (check and replace if necessary)
– Pressure sensor (PT2) on high-pressure side (check and replace if necessary)

Required parts and materials
The part numbers of the parts and materials required for the respective vehicle can be seen in the
assigned scope. For an overview of the campaign scopes, see:  Technical Information 'Warranty
processing'.
For materials (lubricants) required for carrying out the action, see the corresponding Workshop Manual in
PCSS. These lubricants are usually available in the Porsche Center.

Required tools
Tools:

Tools required for testing pressure sensors:
•
•
•

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Battery charger with a current rating of at least 90 A, e.g., VAS 5908 - battery charger 90 A
P90999 - PIWIS Tester 4
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.)

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•
•

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Torque wrench, 6-50 Nm (4.5-37 ftlb.), e.g. V.A.G 1331A - torque wrench, 6-50 Nm (4.5-37
ftlb.)
Torque wrench, 40-200 Nm (30-148 ftlb.) e.g., V.A.G 1332A - torque wrench, 40-200 Nm
(30-148 ftlb.)
Threaded bolts for installing wheel

Tools additionally required for replacement of pressure sensor (PT1) and/or pressure sensor
(PT2):
•
•

Socket wrench, a/f 24, e.g., T40363 - socket wrench, a/f 24
Air conditioning servicing equipment for refrigerant R134a or R1234yf recommended
by Porsche (depending on the refrigerant used). For recommended service equipment, see the
Workshop Equipment and Special Tools Manual.

Preparatory work
Work Procedure: 1

Remove the front left wheel.
 Workshop Manual '440519 Removing and installing wheel'

2

Remove the front section of the front left wheel housing liner.
For procedure, see:
 Workshop Manual '505619 Remove and install the wheel housing liner front'

3

Remove the front-axle support (front section).
 Workshop Manual '400819 Removing and installing front-axle support'

Checking pressure sensors and replacing them if necessary
Work
Procedure:

Information
The installed pressure sensors must be checked using the spare part number and the production date.
All pressure sensors with spare part number 4M0.959.603.C are not OK and must be replaced.
Pressure sensors with spare part number 4M0.959.603.E must also be checked from the applied
production date.
Pressure sensors with spare part number 4M0.959.603.E and applied production date:
•

up to _41921 are not OK and must be replaced.

•

from _42921 are OK and do not need to be replaced.

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Technical Information

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1
2

1

New type of pressure sensor
– Spare part index
– Production date from _42921 (S
/ D / CW / YY - Shift / Weekday /
Calendar Week / Year). Shown in
the image: 1st place not relevant
/ weekday 6 / calendar week 08
/ year2022

Check whether pressure sensor PT1 corresponds
to the new component status.

Checking pressure sensor PT1

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Check whether pressure sensor PT2 corresponds
to the new component status.

Checking pressure sensor PT2
Assessment
(✗)

Action

Pressure sensor with spare part number
4M0.959.603.C

Pressure sensors with spare part index C are not
OK and must be replaced.
Replace the relevant pressure sensors.
 Continue with Step 3 
[ Scope 10 to Scope 12]

(✗)

Pressure sensor with spare part number
4M0.959.603.E and production date up
to_41921

Pressure sensor is not OK due to production date
(up to _41921) and must be replaced.
Replace the relevant pressure sensors.
 Continue with Step 3 
[ Scope 10 to Scope 12]

( )

Pressure sensor with spare part number
4M0.959.603.E and production date
from_42921

Pressure sensor is OK due to spare part index E
and production date (from _42921) and does not
have to be replaced.
End of action.
Continue with  Technical Information '400819
follow-up actions'
[ Scope 9]

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Information
When replacing pressure sensors, it is essential to ensure
that the pressure sensors have the same spare part index.
If one of the pressure sensors has a different index, the
corresponding pressure sensor must also be replaced.
The index is visible on the pressure sensor.
1
3

– Spare part index for pressure sensor
Replace pressure sensors with old component
status.
For procedure, see:
 Workshop Manual '878319 Removing and
installing pressure sensor (PT1 and PT2)'

Spare part index for pressure sensor