Engine vibrations perceived at low rpm Camshaft adjustment fault codes stored
Topic number

LI05.20-P-080257

Version

1

Function group

05.20 - Camshaft, camshaft adjustment

Date

2/13/26

Validity

M254 engine in all model series

Reason for change

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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Fehlendes Sieb des Zentralventils.jpg

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The screen has almost completely broken out

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Neues Zentralventil.jpg

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New central valve with optimized holding ring

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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) and 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 screen is completely 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
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- 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.

Symptoms
Power generation > Engine management > Engine running > Runs rough/shakes
Power generation > Engine management > Indicator lamp > Engine diagnosis > lit

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.

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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

015012

Remove/install/seal cylinder head cover H

Only if there are particles in the oil
filter or the filter screen is missing

015035

Replace the cylinder head cover (cylinder head cover removed)

H

Only if there is damage to the camshaft bearing

057206

Replace camshaft adjuster

H

Only the affected camshaft positioner

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