Service

Technical Information

86/25

ENU

2470

Active Malfunction Indicator Light in Conjunction with Fault Memory Entries regarding Particle
Filter/Differential Pressure Sensor "P245300/P245F00" (86/25)

2

Vehicle Type:

911 GT3 (992)

Model Year:

As of 2025 up to 2026

Concerns:

Rear silencer

Information:

The customer complains about the illumination of the malfunction indicator light in the instrument cluster
in conjunction with one of the following fault memory entries in the DME control unit:
•
•

Action:

P245300 - Particle filter differential pressure sensor, bank 1, implausible signal
P245F00 - Particle filter differential pressure sensor, bank 2, implausible signal

In the event of a complaint, check the production date of the rear silencer and rework the rear silencer if
necessary.
Information
On rear silencers with a production date before 21.08.25, it is possible that the differential pressure line
was not positioned correctly inside the rear silencer.

Required tools
Tools:

•

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.)

Additionally required tools if the rear silencer needs to be reworked:
•
•
•
•
•
•
•
•

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.)
V.A.G 1601 - Torque Wrench 150–800 Nm (111–592 ftlb.)
9794 - Assembly aid
VAS 6266A - Wheel fitting trolley
Drill template TI 86/25
Commercially available felt-tip pen with a shaft diameter of 15 mm (e.g. Edding pen 3000 Ø 15 mm)
Standard metal drill Ø 8 mm, suitable for stainless steel

Required parts and materials
Information
Only the M6x16 (PAF910423) oval head 6-lobe bolt is required for testing the rear silencer.

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Service
2470

ENU

Technical Information

86/25

Information
TKR parts procurement
The drilling template required for reworking the rear silencer must be ordered via the online shop of TKR
Automotive GmbH.
The link for the online shop is:
http://www.tkr-connector.com
Various search functions are available to help you identify
the TI 86/25 Template e.g. by entering the part number or
using a graphic search function.
Order the required parts individually as required or as a
collective order using the ordering process for the TKR
Automotive GmbH online shop.
Please observe the following information regarding warranty
processing:

Parts Info:

•

For a collective order, the shipping costs must only
be invoiced once for the first vehicle during warranty
processing as an additional part and with the amount
as per invoice. For all other vehicles on which parts
from this collective order will be used, only the parts
and labor time must be invoiced in the warranty claim.

•

Document a copy of the invoice in the warranty claim.

TKR Automotive GmbH online shop

Part No.

Designation
– Location

Number

PAF910423

⇒ Oval head 6-lobe bolt M6 x 16
– Lower part of rear spoiler (diffuser)

5 piece(s)

Required parts if the rear silencer must be reworked:
9GT251235A

⇒ Gasket
– Catalytic converter

2 pieces

9GT251571A

⇒ Restraining strap
– Rear silencer

2 pieces

PAF108103

⇒ Hexagon-head bolt (combi) with hexagon socket head
(duo)
– Rear spoiler (lower part)

2 pieces

TKR article number

⇒ Template TI 86/25

1 piece

HAW-POR-0000081

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Technical Information
Material:

86/25

ENU

2470

2

Materials required if the rear silencer needs to be replaced (usually already available in the Porsche Center)
Part No.

Designation
– Location

Quantity

00004330618

⇒ Hot screw paste
– Rear silencer

Quantity as
required

00004330508

⇒ Mounting paste
– Wheel hub/central lock

Quantity as
required

Checking rear silencer
1

Remove rear spoiler lower part (diffuser).

⇒ Workshop Manual '665919 Removing and installing rear spoiler lower part (diffuser)'
Information
The production date of the rear silencer is on the underside on the right in the direction of travel.

2

Þ Production date of rear silencer -1- of the rear silencer.
Check and evaluate the production date ⇒

Production date of rear silencer

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Technical Information

86/25
Assessment

( )

Action

Production date from August 22, 2025.

Rear silencer is OK and does not need to be reworked
Continue troubleshooting in some other way.
Continue with:
Install rear spoiler lower part (diffuser).
⇒ Workshop Manual '665919 Removing and
installing rear spoiler lower part (diffuser)'

✗)
(✗

Production date up to August 21, 2025.

Rear silencer needs to be reworked.
For work procedure, see:
⇒ Technical Information '665919 Reworking rear
silencer'

Reworking rear silencer
Information
The objective of the rework is to make one 8 mm hole on each of the inner sides of the rear silencer.
The 1 mm thick inner panel of the rear silencer is pierced and the differential pressure pipe behind it is
exposed.
Work Procedure: 1
2

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Remove rear silencer and place it aside securely.

⇒ Workshop Manual '263319A8 Removing and installing rear silencer'
Þ Reworking rear silencer on cylinder side bank 1 -1- with drilling template ⇒
Þ
Rework rear silencer ⇒
Reworking rear silencer on cylinder side bank 1 -2- on cylinder side bank 1, on the left in the direction of
travel.

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Technical Information

86/25

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2470

2

Reworking rear silencer on cylinder side bank 1

3

2.1

Þ Reworking rear silencer on cylinder side bank 1 -2- with the "B1"
Align the drilling template ⇒
Þ Reworking rear silencer on cylinder side bank 1 -1- according to the
side on the rear silencer ⇒
Þ Reworking rear silencer on cylinder side bank 1 -3-.
markings⇒

2.2

Using a pointed, waterproof felt-tip pen with a shaft diameter of Ø 15 mm (e.g. Edding pen
Þ Reworking rear silencer on cylinder side bank 1 -4- a marking ⇒
Þ
3000 Ø 15 mm), insert ⇒
Reworking rear silencer on cylinder side bank 1 -Arrow- on the inside of the rear silencer through
Þ Reworking rear silencer on cylinder side bank 1 -1- pen guide.
the ⇒

2.3

Þ Reworking rear silencer on cylinder side bank 1 -2- drilling template.
Remove ⇒

Þ Reworking rear silencer on cylinder side bank 2 -1- with drilling template ⇒
Þ
Rework rear silencer ⇒
Reworking rear silencer on cylinder side bank 2 -2- on cylinder side bank 2, on the right in the direction
of travel.

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Technical Information

86/25

Reworking rear silencer on cylinder side bank 2
3.1

Þ Reworking rear silencer on cylinder side bank 2 -2- with the "B2"
Align the drilling template ⇒
Þ Reworking rear silencer on cylinder side bank 2 -1- according to the
side on the rear silencer ⇒
Þ Reworking rear silencer on cylinder side bank 2 -3-.
markings⇒

3.2

Using a pointed, waterproof felt-tip pen with a shaft diameter of Ø 15 mm (e.g. Edding pen
Þ Reworking rear silencer on cylinder side bank 2 -4- a marking ⇒
Þ
3000 Ø 15 mm), insert ⇒
Reworking rear silencer on cylinder side bank 2 -Arrow- on the inside of the rear silencer through
Þ Reworking rear silencer on cylinder side bank 2 -1- pen guide.
the ⇒

3.3

Þ Reworking rear silencer on cylinder side bank 2 -2- drilling template.
Remove ⇒

4

Grain markings for hole on both sides of the rear silencer.

5

Cover catalytic converter to prevent contamination/damage from drilling.
Information
The ceramic catalytic converter used is made of brittle material.
If the catalytic converter is damaged during drilling, the rear silencer must be replaced.

6

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Þ
Position bore with Ø 8 mm metal drill as vertically as possible to the surface, in doing so only drill ⇒
Bore with pressure pipe lying behind it -1- through the inner panel of the rear silencer, which is approximately 1 mm thick.

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Technical Information

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Þ
After the rear silencer inner panel has been drilled ⇒
Bore with pressure pipe lying behind it -1- through, the
Þ Bore
connection to the differential pressure pipe is ⇒
with pressure pipe lying behind it -2- visible.
1
2
3

– Drill hole 8 mm in rear silencer inner panel
– Exposed connection to differential pressure
pipe
– Catalytic converter

7

Repeat work steps 5 and 6 on the other side.

8

Deburr both holes and thoroughly remove chips from
the area.

9

Install rear silencer.
⇒ Workshop Manual '263319A8 Removing and installing rear silencer'

Bore with pressure pipe lying behind it

End of action.

Labor position and PCSS encryption
Labor position:
APOS

Labor operation

26330140

Checking rear silencer

26334940

Reworking rear silencer

I No.

PCSS encryption:
Location (FES5)

26330

Rear silencer

Damage type (SA4)

1031

incorrectly connected, mixed up

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.

© 2026 Porsche Cars North America, Inc.

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