B180118

9/4/2019
18 01 18_DIAGNOSING NOISE FROM THE REAR EXHAUST FLAP (B58)
SIB 18 01 18
DIAGNOSING NOISE FROM THE REAR EXHAUST FLAP (B58)
2019-08-07
This Service Information Bulletin (Revision #1) replaces SI B18 01 18 dated February 2018.
What’s New (Specific text highlighted):
• Warranty Labor Operations changed
MODEL
F22 (2 Series Coupe)
F33 (4 Series
Convertible)
F23 (2 Series
Convertible)
F34 (3 Series Gran
Turismo)
F30 (3 Series Sedan )
F32 (4 Series Coupe)
F36 (4 Series Gran
Coupe)
All with the B58 engine.
SITUATION
There is a rattling noise from the rear exhaust flap during initial start-up. The rattle could last up to sixty
seconds.
CAUSE
1. DME software application error (I-level is lower than F020-17-11-540) may cause the flap to
stay in an undefined position which will cause it to rattle due to not being supported against a
stop.
2. Loose or failed attachment bow (aka “fixing bow”; the clip that connects the exhaust flap
actuator to the exhaust flap)
3. Excessive play in the pivot bushing of the exhaust flap.
CORRECTION
Check the exhaust flap on cold start. The exhaust flap will remain closed for 30 – 60 seconds for catalyst
warm up.
1. If the flap does not fully close during this warm up phase – Reprogram the DME to F020-17-11540 or higher.
Note that ISTA Next will automatically reprogram and code all programmable control modules that do not
have the latest software.
Always connect a BMW-approved battery charger/power supply (SIB04 23 10).
For information on programming and coding with ISTA, refer to CenterNet / TIS / Technical Documentation /
Programming and Diagnostics / Programming Documentation.
2. If the attachment bow (1) is loose or damaged
or missing – Replace the attachment bow.
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18 01 18_DIAGNOSING NOISE FROM THE REAR EXHAUST FLAP (B58)
3. If the flap is operating as designed (closes fully
with attachment bow installed), apply pressure to
the bushing of the flap.
If the rattle goes away, replace the rear muffler
with exhaust flap.
NOTE: If the flap is rattling due to the
software error, the rattle will also go away when
applying pressure to the bushing.
Check for the software issue first before
diagnosing the bushing and replacing
the rear muffler.
PARTS INFORMATION
Refer to ETK.
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks.
Defect Code:
1812033900
Exhaust flap, rear silencer disruptive noises
Labor Allowance:
Work time (WT)
Description:
Work time to check the exhaust flap as described in
this bulletin. Claim in conjunction with one of the
applicable repairs performed from the list below
(Vehicle is already in the workshop)
Diagnosis (as needed)
Labor Operation:
18 99 000
Work time labor operation code 18 99 000 is not considered a Main labor operation; however, it does require
an individual punch time and an explanation on the repair order and in the claim comments section.
Note: Only one main labor operation can be claimed per repair visit. All other labor operations on the same
line or other lines must be claimed using plus code labor operations.
Vehicle Programming and Encoding (Vehicles below F020-17-11-540)
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18 01 18_DIAGNOSING NOISE FROM THE REAR EXHAUST FLAP (B58)
Labor Operation:
00 00 006
Labor Allowance:
Refer to AIR
Description:
Performing vehicle test (with vehicle diagnosis system
– checking faults) (Main work)
Or:
00 00 556
Refer to AIR
Performing vehicle test (with vehicle diagnosis system
– checking faults) (Plus work)
And:
61 21 528
Refer to AIR
Connect an approved battery charger/power supply
(indicated in AIR as Charging battery)
And:
61 00 730
Refer to AIR
Programming/encoding control unit(s)
If you are using a Main labor code for another repair, use the Plus code labor operation 00 00 556 instead of
00 00 006.
Refer to AIR for the corresponding flat rate unit (FRU) allowances.
During the same workshop visit, if a vehicle also requires another Technical Campaign or repair that
also includes programming and encoding the control units, the programming procedure may only
be invoiced one time.
The programming procedure automatically reprograms and encodes all vehicle control modules which do
not have the latest software i-level. If one or more control module failures occur during this programming
procedure:
Claim this consequential control module-related repair work under the defect code listed in this bulletin with
the applicable AIR labor operations.
Please explain this additional work (The why and what) on the repair order and in the claim comments
section.
For control module failures that occurred prior to performing this programming procedure:
When covered under an applicable limited warranty, claim this control module-related repair work using the
applicable defect code and labor operations in AIR.
And/or:
Replacing the attachment bow
Labor Operation:
18 12 081
Or:
18 12 581
Labor Allowance:
Refer to AIR
Description:
Replacing exhaust flap actuator drive (Main work)
Refer to AIR
Replacing exhaust flap actuator drive (Plus work)
If you are using a Main labor code for another repair, use the Plus code labor operation 18 12 581 instead of
18 12 081.
Or:
Replacing the rear muffler
Labor Operation:
Labor Allowance:
Description:
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18 12 031
Or:
18 12 531
18 01 18_DIAGNOSING NOISE FROM THE REAR EXHAUST FLAP (B58)
Refer to AIR
Replacing the rear silencer (Main work)
Refer to AIR
Replacing the rear silencer (Plus work)
If you are using a Main labor code for another repair, use the Plus code labor operation 18 12 531 instead of
18 12 031.
Refer to AIR for the corresponding flat rate unit (FRU) allowances.
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