LI01.20-P-076894

M274 Check engine light, P052E71 Crankcase ventilation valve
Topic number
LI01.20-P-076894
Version
1
Function group
01.20 - Crankcase ventilation, cylinder head cover
Date
9/8/23
Validity
Passenger car with engine M274
Reason for change
Complaint
Check engine light illuminated
Fault code stored in N3/10 control unit- P052E71 – Positive Crankcase Ventilation Regulator Valve Performance: The
valve for crankcase ventilation has a malfunction
Cause
The partial-load ventilation valve (a part of the intake line assembly) may not work as intended
Remedy
Performed guided test for fault code P052E71. Replace intake line assembly if necessary per results of the guided
test.
Do not perform software update of N3/10 Engine control unit at this time. This LI will be updated once the software solution is available.
This LI is in relation to NCU dated 8/31/2023 "Emission Extended Warranty – Intake Line Assembly".
WIS-References
Document number
Title
Note
AR01.20-P-9692MRU
Remove/install oil separator on crankcase
Symptoms
Power generation > Exhaust system > Function > Fumes/blue smoke
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
Parts
08.09.2023 22:48:02
© Copyright Mercedes-Benz AG
CBUTCHE
Page 1 / 2
Part number
ES1 ES2 Designation
A274090560080
Quantity Note
Intake line assembly
1
EPC
inclusive of oil separator, partial load
ventilation valve and full-load ventilation valve
X
Control unit/fault code
Control unit
Fault text
N3/10 - Motor electronics 'MED40' for combustion engine P052E71 - The valve for crankcase ventilation has a mal'M274' (ME) (MED40)
function. The actuator is blocked.
Operation numbers/damage codes
Op. no.
Operation text
Time
Solenoid valve, crankcase ventilation
system
08.09.2023 22:48:02
© Copyright Mercedes-Benz AG
CBUTCHE
Damage
code
Note
0101D
Damage code
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