LI49.20-P-057101

Fault code 20B91B, 20B913 (The output for the heating element of the AdBlue pressure line has an electrical
fault or an open circuit) is stored in the SCR control unit.
Topic number
LI49.20-P-057101
Version
1
Design group
49.20 Exhaust aftertreatment unit
Date
08-17-2013
Validity
Model 166 with engine 642 and SA code U42 (BlueTEC
(SCR) diesel exhaust treatment)
Model 166 with engine 651 and SA code U42 (BlueTEC
(SCR) diesel exhaust treatment)
Reason for change
Reason for block
Complaint:
Engine diagnosis warning lamp lights up.
Fault code 20B91B, 20B913 (The output for the heating element of the AdBlue pressure line has an electrical fault or
an open circuit) is stored in the SCR control unit.
Cause:
Heating element of AdBlue pressure line nonfunctional.
Remedy:
Replace the AdBlue pressure line, check software in the SCR control unit and update if necessary.
Symptoms
Power generation / Engine management / Engine management indicator lamp / Engine diagnosis / lit
Control unit/fault code
Control unit
Fault code
Fault text
SCR - Selective catalytic reduction (N118/5) (SCRCM)
20B91B
The output for the heating element of the AdBlue® pressure line
has an electrical fault or an open circuit.
SCR - Selective catalytic reduction (N118/5) (SCRCM)
20B913
The output for the heating element of the AdBlue® pressure line
has an electrical fault or an open circuit.
Parts
Part number
ES1 ES2 Designation
08-17-2013 7:06 AM
© Copyright Daimler AG
Quantity Note
PAHIGGI
EPC Other
ma-
Page 1/2
ke
part
A 166 470 96 64
Additive line
1
Valid for model designation
166.0
X
A 166 470 97 64
Additive line
1
Valid for model designation
166.8
X
Work units
Op. no.
Operation text
Time
Damage
code
Note
47158 04
Heating element for AdBlue line
Validity
Vehicle
Engine
Transmission
166.003
*
*
166.004
*
*
166.023
*
*
166.024
*
*
166.824
*
*
08-17-2013 7:06 AM
© Copyright Daimler AG
PAHIGGI
Page 2/2