122-H3M7J-05

911 (991)
Technical Information
41/18
ENU
2673
2
Support for Evaluating Components: When Working on the Exhaust System (SI 41/18)
Information
This Technical Information shall remain valid until further notice.
Model Line
911 (991)
Model Year:
As of 2017 up to 2018
Subject:
Exhaust system
Information:
The monolith in the catalytic converter may be damaged.
Remedial
Action:
To verify catalytic converter damage, both oxygen sensors  Installation overview of oxygen sensors
on engine side, cylinders 1-3 (shown on the 911 Carrera) -1 and 2- can be removed and the catalytic
converter examined using a video endoscope prior to any disassembly.
Installation overview of oxygen sensors on engine side, cylinders 1-3 (shown on the 911 Carrera)
Tools:
VAS 6748 - Video endoscope (or similar tool/commercially available)
VAS 6748/5 - Probe, Ø 6 mm, 90° viewing direction, for video endoscope (example, Snap-on
BK5500Dual55 or BK8500Dual55)
AfterSales
Apr 20, 2018
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911 (991)
2673
ENU
Work Procedure: 1
Technical Information
41/18
Remove oxygen sensors.
 Workshop Manual '246919 Removing and installing oxygen sensor upstream of catalytic
converter'
 Workshop Manual '247319 Removing and installing oxygen sensor downstream of catalytic
converter'
Information
2
•
Before doing any other work, any damage must be documented by taking photos if at all
possible before removing the catalytic converter or exhaust system and these must be
included as an attachment to the PQIS job.
•
PCNA Technical Support must be informed.
Check monolith in the catalytic converter for damage:
2.1
Examine the surface of the monolith by inserting VAS 6748 - video endoscope (recommended tool - or similar tool/commercially available) and if necessary, VAS 6748/5 probe, Ø 6 mm, 90° viewing direction, for video endoscope (recommended tool - or
similar tool/commercially available) through the opening on the oxygen sensor.
Example of damage  Example: Damage to
surface of monolith (1) -1- to the surface of
the monolith.
Example of damage  Example: Damage to
surface of monolith (2) -1- to the surface of
the monolith.
Example: Damage to surface
of monolith (1)
Apr 20, 2018
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AfterSales
911 (991)
Technical Information
41/18
ENU
2673
2
Example: Damage to surface
of monolith (2)
Invoicing:
For invoicing and documentation using PQIS, enter the following coding:
Location (FES5)
26730
Catalytic converter
Damage type (SA4)
1511
Break
References:
 Workshop Manual '246919 Removing and installing oxygen sensor upstream of catalytic converter'
 Workshop Manual '247319 Removing and installing oxygen sensor downstream of catalytic converter'
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.
©2018 Porsche Cars North America, Inc.
AfterSales
Apr 20, 2018
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