Engine Controls System: 2751

2751 - P112D

Information saved in
DME

Fault code
2751 - P112D

Fault text
Oxygen sensor fault pump current cable before catalytic
converter, bank 2

Fault description
O2 Sensor Negative Current or Positive Current Control
Circuit/Open (Bank 2 Sensor 1)

Condition for fault identification
Test condition:
Lambda factor lies within this range 1.001
(K_LAVK_OBD_PLAU_LAM_MIN) and 1.009
(K_LAVK_OBD_PLAU_LAM_MAX) and the post-
catalyst lambda is still outside the range 88 mV
(K_LAVK_OBD_PLAU_LANK_MAX) and 879 mV
(K_LAVK_OBD_PLAU_LANK_MIN) OR oxygen sensor
voltage
Terminal condition: Engine running - Condition idle or part-
load
Voltage condition:
none

Condition for fault memory entry
none

Action in service
1. Check plug and wiring harness on pre-cat oxygen sensor
LSVK B2 (especially IP pumping current),
2. If OK, replace oxygen sensor

Fault effect and breakdown warning
MIL lamp on after engine runs 2x /Small influence on
drivability

Driver information
Warning light:
MIL

Service instruction
none