NHTSA ID Number: 11029916
Manufacturer Communication Number: LI05.20-P-080329
TSB/Document Date: 2026-03-09
Summary
Complaint Engine vibrations perceived at low rpm. Fault codes for the camshaft position of the intake camshaft (P001100, P001104, P001200) or exhaust camshaft (P001400, P001404, P001500) may be stored. Cause Continuously fluctuating oil pressure in the central valve may lead to damage to the filter screen on the central valve. This can result in damage to the filter screen or the filter screen breaking loose. The resulting loss of oil pressure prevents proper adjustment of the camshaft adjuster. If the filter screen breaks loose, parts of it may settle in the camshaft adjuster or in the camshaft. If there are parts in the camshaft, they can pass through the oil supply bore to the last camshaft bearing (i.e., the first camshaft bearing behind the adjuster) which could cause damage there. Remedy 1. In cases in which only the screen of the central valve is damaged and no metal particles are found in the oil filter, the following parts must be replaced: - Always both central valves - The camshaft adjuster of the damaged central valve 2. In cases where the sieve is completely/partially missing and metal particles are found in the oil filter, the camshaft bearings must be checked. If any damage is visible there, proceed as follows: - Both central valves - The camshaft adjuster of the damaged central valve - The camshaft bearing housing (camshafts are already included here) - Oil change with oil filter
Engine vibrations perceived at low rpm Camshaft adjustment fault codes stored
Topic number
LI05.20-P-080329
Version
1
Function group
05.20 - Camshaft, camshaft adjustment
Date
3/2/26
Validity
M254 engine in all model series
Reason for change
Replaces LI05.20-P-080257
Complaint
Engine vibrations perceived at low rpm. Fault codes for the camshaft position of the intake camshaft (P001100,
P001104, P001200) or exhaust camshaft (P001400, P001404, P001500) may be stored.
Attachments
File
Description
Gebrochenes Sieb im Zentralventil.jpg
Here, the filter screen is protruding from one of the holes
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-Benz AG
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Fehlendes Sieb des Zentralventils.jpg
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© Copyright Mercedes-Benz AG
The screen has almost completely broken out
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Neues Zentralventil.jpg
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© Copyright Mercedes-Benz AG
New central valve with optimized holding ring
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Camshaft bearing damage.jpg
Camshaft and bearing damage
Cause
Continuously fluctuating oil pressure in the central valve may lead to damage to the filter screen on the central valve.
This can result in damage to the filter screen or the filter screen breaking loose.
The resulting loss of oil pressure prevents proper adjustment of the camshaft adjuster.
If the filter screen breaks loose, parts of it may settle in the camshaft adjuster or in the camshaft. If there are parts in
the camshaft, they can pass through the oil supply bore to the last camshaft bearing (i.e., the first camshaft bearing
behind the adjuster) which could cause damage there.
Remedy
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1. In cases in which only the screen of the central valve is damaged and no metal particles are found in the oil filter,
the following parts must be replaced:
- Always both central valves
- The camshaft adjuster of the damaged central valve
2. In cases where the sieve is completely/partially missing and metal particles are found in the oil filter, the camshaft
bearings must be checked. If any damage is visible there, proceed as follows:
- Both central valves
- The camshaft adjuster of the damaged central valve
- The camshaft bearing housing (camshafts are already included here)
- Oil change with oil filter
WIS-References
Document number
Title
Note
AR05.20-P-6997MRV
Remove/install camshaft housing with Engine 254.9 in model 206, Engine
camshafts
254.9 in Model 236, Engine 254.9 in
Model 254
AR05.20-P-6997MRX
Remove/install camshaft housing with Engine 254.9 in Model 167
camshafts
AR05.20-P-6997WEE
Remove/install camshaft housing with Engine 254.9 in Model 214
camshafts
AR05.20-P-7206MRV
Remove/install intake camshaft positioner
Engine 254.9 in model 206, Engine
254.9 in Model 236, Engine 254.9 in
Model 254
AR05.20-P-7206MRX
Remove/install intake camshaft positioner
Engine 254.9 in Model 167
AR05.20-P-7206WEE
Remove/install intake camshaft positioner
Engine 254.9 in Model 214
AR05.20-P-7207-01MRV
Mark and align the exhaust camshaft
positioner
Engine 254.9 in Model 167 Engine
254.9 in Model 206 Engine 254.9 in
Model 214 Engine 254.9 in Model 236
Engine 254.9 in Model 254
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
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.
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Symptoms
Power generation > Engine management > Engine running > Runs rough/shakes
Power generation > Engine management > Indicator lamp > Engine diagnosis > lit
Power generation > Engine management > Engine performance > No/poor output
Control unit/fault code
Control unit
Fault text
N3/10 - Motor electronics 'MRG2' for combustion engine
'M254' (ME) (MRG2)
P001500 - Adjustment of the exhaust camshaft (cylinder
bank 1) is performed late. _
P001404 - The position of the exhaust camshaft (cylinder
bank 1) deviates from the specified value. There is an internal fault.
P001400 - The position of the exhaust camshaft (cylinder
bank 1) deviates from the specified value. _
P001200 - Adjustment of the intake camshaft (cylinder
bank 1) is performed late. _
P001104 - The position of the intake camshaft (cylinder
bank 1) deviates from the specified value. There is an internal fault.
P001100 - The position of the intake camshaft (cylinder
bank 1) deviates from the specified value. _
Operation numbers/damage codes
Op. no.
Operation text
Time
Damage
code
Note
H
0540A
38: loose
H
0540E
38: loose
015510
Remove/install camshaft housing
AW
Only if there are particles in the oil
filter or the filter screen is missing
015521
Replace camshaft housing (removed)
AW
Only if there is damage to the camshaft bearing
057206
Replace camshaft adjuster
AW
Only the affected camshaft positioner
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TSB/Document ID: LI05.20-P-080329
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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