No. 68-21-1

Symptom-based workshop manual
Service
68/21
ENU
2651
2
Symptom – Body Exterior – Rattling/Noises from the Rear Area of the Exhaust System:
Observe Specified Procedure (SY 68/21)
Model Line:
Panamera (971)
Model Year:
As of 2017 up to 2021
Concerns:
Exhaust flap actuator
Symptom:
The customer complains about rattling or noise from the rear area of the exhaust system. The following
entries may be stored in the fault memory of the DME control unit:
•
•
'P047600 – 'Exhaust flap, signal implausible'
'P04A000 – 'Exhaust flap, bank 2, signal implausible'
Cause:
The reason for this may be a defective actuator for an exhaust flap.
Remedial
Action:
Check exhaust flap, see  Technical Information 'Checking exhaust flap' and repair it as required.
Preparatory work
Work Procedure: 1
Remove rear underbody cover.  Workshop Manual '519419 Removing and installing cover for rear
underbody'
Checking exhaust flap
Work Procedure: 1
Is the customer's complaint connected to the noise?
•
•
Yes, continue with Step 2.
No, continue with Step 5.
2
Check the exhaust flap actuator.
2.1
Remove the exhaust flap actuator.  Workshop Manual '265119 Removing and installing
exhaust flap actuator'
2.2
Check the exhaust flap actuator for damage.
•
The exhaust flap actuator is not damaged: Continue with Step 3.
•
The exhaust flap actuator is damaged: Replace exhaust system actuator.  Workshop Manual
'265119 Removing and installing exhaust flap actuator'
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Service
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Symptom-based workshop manual
68/21
Parts required:
Part number
Designation
Qty.
99904903240
 Plastic hexagon nut
5 ea.
9A713324606
 Servo motor for exhaust flap
1 ea.
3
Check the exhaust flap mechanism in the exhaust pipe for damage, play or blockage.
Information
The exhaust flap actuator you removed earlier must remain removed during the check.
The check is performed manually.
•
Exhaust flap mechanism is OK: Continue with Step 4.
•
The exhaust flap mechanism is not OK: Replace rear silencer.  Workshop Manual '263355
Replacing rear silencer'
Parts required:
Part number
Designation
Qty.
99904903240
 Plastic hexagon nut
5 ea.
Clamping sleeve *
1 ea.
Rear mufflers (right or left) *
1 ea.
* Select the vehicle-specific parts using the Porsche Spare Parts Catalogue (PET).
4
Install the exhaust flap actuator.  Workshop Manual '265119 Removing and installing exhaust flap
actuator'
5
Connect 9900 - PIWIS Tester 3 to the vehicle and read out the fault memory of the DME control
unit.
Result of check
( )
One of the following entries is stored
in the fault memory of the DME control
unit:
•
•
'P047600 – 'Exhaust flap,
signal implausible'
'P04A000 – 'Exhaust flap, bank
2, signal implausible'
Action required
Check plug connection for exhaust flap
actuator.
Check the plug connection of the exhaust flap
actuator for the following points and repair it if
necessary:
•
•
•
•
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Risk of damage to plug connection, pins and
electric lines.
Plug connection and pins are seated correctly.
Corrosion of pins and electric lines.
Risk of short circuit
Service
Symptom-based workshop manual
68/21
ENU
2651
2
If all components specified above appear normal,
replace the exhaust flap actuator.  Workshop
Manual '265119 Removing and installing exhaust
flap actuator'
(✗)
None of these entries is stored in the
fault memory of the DME control unit.
Repeat the test.
If there is no noise from the exhaust system and no
fault memory entry, the customer's problem must be
checked and may have to be simulated.
If the noise still cannot be heard, the test must be
performed starting with Step 1.
Concluding work
Work Procedure: 1
Install rear underbody cover.  Workshop Manual '519419 Removing and installing cover for rear
underbody'
Invoicing
Invoicing:
For documentation and warranty invoicing, enter the labor operations specified below in the warranty
claim:
APOS
Labour operation
I No.
26510240
Checking exhaust flap actuators
26335551
Replacing rear silencer
26335552
Replacing rear silencer
26335650
Replacing rear silencer
PQIS coding:
Location (FES5)
26510
Exhaust flap actuator
Damage type (SA4)
2014
rattles
Parts Info:
Part No.
Designation
Qty.
99904903240
Hexagonal plastic collar nut
5 ea.
Only if an exhaust system actuator has to be
replaced:
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Service
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Symptom-based workshop manual
68/21
9A713324606
1 ea.
Servo motor for exhaust flap
Only if a rear silencer has to be replaced:
As required.
1 ea.
Rear muffler, right
or
As required.
1 ea.
Rear muffler, left
and
As required.
References:
1 ea.
Clamping sleeve
 Workshop Manual '519419 Removing and installing cover for rear underbody'
 Workshop Manual '265119 Removing and installing exhaust flap actuator'
 Workshop Manual '263355 Replacing rear silencer'
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.
© 2021 Porsche Cars North America, Inc.
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