No. 71-25 Service Bulletin/Repair Instructions

Service
Technical Information
71/25
ENU
9X00
9
Information on Y-Measuring Cables and Possible Locations (71/25)

Model Line:
All model lines

Information

The Y-measuring cables described can generally be used on all Porsche vehicles even if this Technical Information is not available for every specific vehicle in PCSS.
Model Year:
As of 2017
Concerns:
Y-measuring cables (Y-measuring adapters)
Information:
Y-measuring cables are now available for vehicle diagnosis via Porsche AG (PAG).

The use of Y-measuring cables is recommended to facilitate meaningful and reliable measurements.

The measurement cables allow measurements in the active circuit, i.e. in the current-loaded state, which

depicts realistic operating conditions.

This allows sensor signals and actuator activation to be detected in real-time operation using an oscilloscope

or measuring device. By using these test leads, we are getting more accurate results because of the low

contact resistance. Using conventional multimeter leads might cause bad readings due to high contact resistances. This significantly improves the quality and accuracy of the measurements.

The Y-measuring cables are connected between the wiring harness-side plug and the component and have

branches for connecting measuring devices.

In some cases, the measuring cables are designed with individual lines, which makes it much easier to

connect a current-measuring amp clamp and thus facilitates a combined measurement of voltage and

current measurement with the oscilloscope.
WARNING

High voltage on rod ignition modules, fuel injectors and other live parts

•
Severe burns or death
•
Electric shock upon contact with live parts
•
Health risks for persons with life-assisting systems
Þ

⇒
Only start the engine if the rod ignition modules, fuel injectors and other live parts are completely installed and

connected.
Þ

⇒
Only perform work on the rod ignition modules, fuel injectors and other live parts when the ignition is switched off.
Þ

⇒
Only install measuring cables when the ignition is switched off.
AfterSales
Jan 27, 2026

Page 1 of 12
9
Service

9X00
Tools: (As of

January 2026)
ENU
Technical Information
71/25
Tool
Name
MRT / Opt
VAS 5256
Adapter, measuring technology /

DSO, 2-pin
MRT
VAS 5256 / 1
Adapter, measuring technology /

DSO, 2-pin
Not Available through PAG
VAS 5257
Adapter, measuring technology /

DSO, 3-pin
MRT
VAS 5258A
Adapter for measuring equipment

/ DSO, 4-pin
Optional
VAS 5259
Adapter, measuring technology /

DSO, 2-pin
Optional
VAS 5260A
Adapter for measuring equipment

/ DSO
MRT
VAS 5570
Adapter, measuring technology /

DSO, 3-pin
Optional
VAS 5571
Adapter, measuring equipment /

DSO, 2+3-pin
MRT
VAS 5577
Adapter, measuring technology /

DSO, 4-pin
Optional
VAS 5578
Adapter for measuring equipment

/ DSO
Optional
VAS 5579
Adapter for measuring equipment

/ DSO, 8-pin
Optional
VAS 5583
Adapter for measuring equipment

/ DSO
Optional
Overview of known measuring points

Overview:
Jan 27, 2026

Page 2 of 12
Location
Model line
Engine

variant/location

(if relevant)
Plug-in contact

part number
Suitable

measuring cable
Front axle and rear

axle damper valve
Macan (95B)
-
8K0973702
Rear axle damper

valve
911 (992)
-
8K0973702D
VAS 5256

- Adapter,

measuring

equipment/DSO,

2-pin
AfterSales
Service
Technical Information
71/25
Rear axle air spring

valve
Panamera (971)

Cayenne

(9YA/9YB)

Taycan

(Y1A/Y1B/Y1C)
-
8K0973702D
CAN air

suspension

compressor
Panamera (971)

Cayenne

(9YA/9YB)

Taycan

(Y1A/Y1B/Y1C)
-
8K0973702D
Front axle damper

valve
Taycan

(Y1A/Y1B/Y1C)
-
8K0973702E
12-volt air

suspension

compressor
Macan (95B)
-
1J0973752
12-volt air

suspension

compressor
Panamera (971)

Cayenne

(9YA/9YB)

Taycan

(Y1A/Y1B/Y1C)
-
3B0973752A
Rear axle damper

valve
Cayenne

(9YA/9YB)
-
9Y0973752B
Front axle damper

valve
Cayenne

(9YA/9YB)
-
9Y0973752E

9Y0973752D
Front axle level

sensor
911 (992)

Panamera (971)

Cayenne

(9YA/9YB)

Taycan

(Y1A/Y1B/Y1C)
-
8K0973703
Air suspension

compressor valves
Macan (95B)
-
8K0973703
Rear axle level

sensor
911 (992)

Panamera (971)

Cayenne

(9YA/9YB)

Taycan

(Y1A/Y1B/Y1C)
-
8K0973703G
AfterSales
ENU
9X00
9
VAS 5257

- Adapter,

measuring

equipment/DSO,

3-pin
Jan 27, 2026

Page 3 of 12
9
Service

9X00
Jan 27, 2026

Page 4 of 12
ENU
Technical Information
71/25
Air suspension

compressor valves
Panamera (971)

Cayenne

(9YA/9YB)

Taycan

(Y1A/Y1B/Y1C)
-
4D0971993
VAS 5570

- Adapter,

measuring

equipment/DSO,

3-pin
Wheel acceleration

sensor
Panamera (971)

Taycan

(Y1A/Y1B/Y1C)
-
971973752
VAS 5571 Adapter
Front axle air

spring valve on

air spring
Taycan

(Y1A/Y1B/Y1C)
-
971973752
Body acceleration

sensor
911 (992)

Panamera (971)

Cayenne

(9YA/9YB)

Taycan

(Y1A/Y1B/Y1C)
-
4H0973323
Air suspension

valve block
Macan (95B)

Panamera (971)

Cayenne

(9YA/9YB)
-
4H0973715
Air suspension

valve block
Taycan

(Y1A/Y1B/Y1C)
-
4H0973715A
Rear axle valve

block
911 (992)
-
4H0973715A
Wheel speed

sensor
911 (992)

Panamera (971)

Cayenne

(9YA/9YB)

Taycan

(Y1A/Y1B/Y1C)
-
6E0973702
VAS 5256/1

- Adapter,

measuring

equipment/DSO,

2-pin
Front axle air

spring valve,

wheel housing

connection point
Panamera (971)

Taycan

(Y1A/Y1B/Y1C)
-
4HO973712
VAS 5258A

- Adapter for

measuring

equipment/DSO,

4-pin
AfterSales
VAS 5583 Adapter for

measurement and

test equipment
Service
Technical Information
71/25
ENU
9X00
9
Power steering

control unit
911 (992)

Taycan

(Y1A/Y1B/Y1C)
-
4H0973713
Rear axle steering

control unit
911 (992)

Cayenne

(9YA/9YB)
-
4H0973713A
Power steering

control unit
Macan (95B)
-
4H0973713H
Engine mount
911 (992)
-
4H0973713K
Engine mount
718 (982)
-
4H0973713B
Valve lift

adjustment
911 (992)
3.0 liter
1040049732
VAS 5260A

- Adapter for

measuring

equipment/DSO
Parking lock

solenoid

12 3

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