No. 2304

1
Bulletin #: 2304
Advanced Technical Information
Part ID: 1750
E3.I/G2 V8 – Oil/Air Separator Membrane Failure
Vehicles Affected
Models
Model Year
Model Type
VIN Range
Vehicle-Specific Equipment
Cayenne
As of 2019
9YA, 9YB
n/a
V8 bi-Turbo engine
Panamera
As of 2017
971
n/a
V8 bi-Turbo engine
Revision History
Revision
Release Date
Changes
0
February 27, 2023
Original document
Condition
E3 Cayenne and G2 Panamera customers report a rough running engine, whistling noise, and/or check engine light
displayed in the instrument cluster. It is found that the diaphragm in the oil breather line (crankcase vent tube) or the
tube itself from either bank 1 or bank 2 can be cracked, causing this failure in the present V8 bi-Turbo engines.
Related Faults:
NOTE: Fault combination and sub-fault information may vary depending on engine type and DME software version.
Area of Occurrence (DME)
P227900 - Leak behind throttle valve, bank 1
P0300(X)00 - Random/Multiple Cylinder, Misfire Detected
Other area of Occurrence (Instrument Cluster)
P162400 - Engine control indicator light switched on
B19A8F0 - Display of reduced engine output, active
B19CAF0 - Display of start-stop failure, active
B19ACF0 - Display of fault in engine controller, active
AfterSales
Feb 27, 2023
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Bulletin #: 2304
Advanced Technical Information
Part ID: 1750
1
Technical Background
The aforementioned condition can result from fatigue. An example of this issue is shown in Figure 1.
Figure 1:
Check-valve in Oil-Air breather line showing
diaphragm failure
Service Information
If the vehicle falls under the previously stated conditions, then please replace only the breather lines shown below in
Figure 2 as “5” and “10” containing this diaphragm in the check-valve assembly, first. If related issues or fault codes
persist after a test drive with the new breather lines installed, check the oil air separator for damage. Please perform
these replacements in accordance with the respective workshop instructions.
Figure 2:
V8 (E3.I & G2) Crankcase Ventilation
AfterSales
Feb 27, 2023
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Bulletin #: 2304
Advanced Technical Information
Part ID: 1750
1
Warranty
As always, please document the repair completely in PCSS.
For this repair, please code the “cause” as follows:
Cause location:
10520 Crankcase ventilation hose
Cause symptom:
1521 Crack/Crack
Search Items
Crankcase ventilation hose, oil/air separator, breather line, cracked valve, Cayenne E3 Turbo, P227900, P030000, 		
G2 Panamera Turbo
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.
A12836
©2023 Porsche Cars North America, Inc.
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Feb 27, 2023
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