(DME) Condition For Fault Memory Entry - 1

2C3E - P112D

Information saved in
DME

Fault code
2C3E - P112D

Fault text
Oxygen sensor before catalytic converter 2, line fault

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

Condition for fault identification
Test condition:
O2 sensor wiring monitor
O2 sensor signal freezes.
No fault memories
Drive at 50 - 80 km/h at moderate engine speed
Terminal condition: Terminal 15, engine on
Voltage condition:
none

Condition for fault memory entry
Voltage seizes at 2V (Lambda = 1) OR voltage < 2.1 V with
overrun injection deactivation active

Action in service
1. Visual inspection of wires, DME plug and O2 sensor for
damage
2. Inspect wires
3. Check plug-in connections DME <=> Wiring harness
<=> Upstream (pre-cat) O2 sensor for Bank 1 (water or
corrosion in plug?) => Repeatedly remove the plug and then
reconnect it FIRMLY)
4. Check catalytic converter (is FSD lean fault entered for
the other bank?)
5. Piston rings, injectors, positive crankcase ventilation OK?
FSD fault? Then continue there!
6. Replace O2 sensor
7. Replace DME

Fault effect and breakdown warning


Driver information
Warning light:
MIL ON

Service instruction
none