NHTSA ID Number: 11018228
Manufacturer Communication Number: LI46.80-P-079280
TSB/Document Date: 2025-05-13
Summary
Complaint Rattling/knocking noise from the rear axle steering is audible when driving on rough terrain or cobblestones. Cause Relative movement of toothed rack relative to housing. Remedy 1. Detach underfloor paneling under rear axle steering. 2. Remove heat shield. 3. Remove large clamps from left bellows. 4. Open small clamps on left using a suitable tool and slide to side. 5. Slide bellows to side. 6. A second person sits in the veh. and steers with activated drive, automatic transmission in N position, to left limit stop. Careful! Risk of entrapment when steering at the same time! Do not move steering wheel during operation steps 7 and 8! 7. Clean screw-on stud of any grease using a clean, lint-free rag. => Up to the area where the stud enters the bearing! Then completely remove grease from screw-on stud with a lint-free rag soaked in safety cleaner (A 000 986 56 01). => Up to the area where the stud enters the bearing! Important: The surface must be entirely clean and free of grease! 8. Then apply Hylomar (A 001 989 25 20 09) all around the degreased screw-on stud using a clean brush. => Up to the area where the stud enters the bearing! 9. Move steering wheel from end stop to end stop several times. Then steer to left limit stop again. Careful! Risk of entrapment when steering at the same time! 10. Then apply Hylomar again. 11. Bellows installation: Coat contact surfaces of bellows and rack-and-pinion steering lightly with Renolit (A094 989 38 00). When doing so, ensure that the grease is underneath the edges of the bellows. Replace large clamps (A 001 995 15 35). The small clamp can be reused. 12. Repeat operation steps 3 to 5 on the other side. 13. A second person sits in the veh. and steers with activated drive, automatic transmission in N position, to right limit stop. Careful! Risk of entrapment when steering at the same time! 14. Then repeat operation steps 7 to 11 for the screw-on stud on the other side. 15. Attach heat shield. 16. Attach underfloor paneling. 17. When relocating the vehicle on the premises, please use Snow Chain Mode through the head unit. 18. Leave the Hylomar to dry for approx. 90 minutes. Note: Deactivate Snow Chain Mode after parking! 19. Then perform a test drive.
Knocking/Rattling noise from rear axle steering when driving on uneven roadway
Topic number
LI46.80-P-079280
Version
2
Function group
46.80 - Auxiliary rear axle steering, auxiliary steering axle
(ZL), electro-hydraulic auxiliary steering (EHZ)
Date
5/8/25
Validity
Model 223, 294, 295, 296, 297 with code 201 (Rear axle
steering) or with code 216 (Rear axle steering with large
angle)
Reason for change
Updating title noises
Complaint
Rattling/knocking noise from the rear axle steering is audible when driving on rough terrain or cobblestones.
Attachments
File
Description
MOV.mp4
Flapping/knocking noise on cobblestones
Cause
Relative movement of toothed rack relative to housing.
Remedy
1.
2.
3.
4.
5.
6.
7.
Detach underfloor paneling under rear axle steering.
Remove heat shield.
Remove large clamps from left bellows.
Open small clamps on left using a suitable tool and slide to side.
Slide bellows to side.
A second person sits in the veh. and steers with activated drive, automatic transmission in N position, to left limit
stop.
Careful! Risk of entrapment when steering at the same time! Do not move steering wheel during operation steps
7 and 8!
Clean screw-on stud of any grease using a clean, lint-free rag.
=> Up to the area where the stud enters the bearing!
Then completely remove grease from screw-on stud with a lint-free rag soaked in safety cleaner (A 000 986 56
01).
=> Up to the area where the stud enters the bearing!
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AG
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Important: The surface must be entirely clean and free of grease!
8.
Then apply Hylomar (A 001 989 25 20 09) all around the degreased screw-on stud using a clean brush.
=> Up to the area where the stud enters the bearing!
9.
10.
11.
Move steering wheel from end stop to end stop several times. Then steer to left limit stop again.
Careful! Risk of entrapment when steering at the same time!
Then apply Hylomar again.
Bellows installation: Coat contact surfaces of bellows and rack-and-pinion steering lightly with Renolit (A094 989
38 00). When doing so, ensure that the grease is underneath the edges of the bellows.
14.
15.
16.
17.
18.
Replace large clamps (A 001 995 15 35). The small clamp can be reused.
Repeat operation steps 3 to 5 on the other side.
A second person sits in the veh. and steers with activated drive, automatic transmission in N position, to right limit stop.
Careful! Risk of entrapment when steering at the same time!
Then repeat operation steps 7 to 11 for the screw-on stud on the other side.
Attach heat shield.
Attach underfloor paneling.
When relocating the vehicle on the premises, please use Snow Chain Mode through the head unit.
Leave the Hylomar to dry for approx. 90 minutes.
19.
Note: Deactivate Snow Chain Mode after parking!
Then perform a test drive.
12.
13.
Attachments
File
Description
Hylomar.JPG
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Hylomar Application Area.jpg
Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
12.05.2025 16:51
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CCUSHWA
Page 3 / 4
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Chassis/suspension > Noises > Knocks
Chassis/suspension > Steering system > Noises > Cracking
Chassis/suspension > Steering system > Noises > Chattering/knocking
Chassis/suspension > Steering system > Noises > Clattering
Chassis/suspension > Noises > Clattering
Chassis/suspension > Steering system > Rear axle steering (HAL) > Noises > Operating noise
Chassis/suspension > Steering system > Rear axle steering (HAL) > Noises > On rough road
Parts
Part number
ES1 ES2 Designation
A 000 986 56 01
A001 989 25 20
09
A001 995 15 35
A094 989 38 00
11
Quantity Note
EPC
Assembly cleaner/assembly
power cleaner
1
Must be degreasing
Hylomar (100 g)
1
X
One-ear clamp
2
X
Complex grease (e.g. Renolit
CX-EP 2)
1
As needed and enough for several
veh.
X
X
Operation numbers/damage codes
Op. no.
Operation text
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© Copyright Mercedes-Benz AG
Time
CCUSHWA
Damage
code
Note
Page 4 / 4
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TSB/Document ID: LI46.80-P-079280
Replacement Service Bulletin Number:
MFR Communication Date: 2025-05-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SUSPENSION
MFR Component System:
MFR Component Subsystem:
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