2C3E - P112D

2020 BMW 128i Coupe (E82) L6-3.0L (N51) Diagnostic Trouble Codes ( DTC ): Service instruction

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(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

Visual inspection of wires, DME plug and O2 sensor for damage

Inspect wires

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)

Check catalytic converter (is FSD lean fault entered for the other bank?)

Piston rings, injectors, positive crankcase ventilation OK? FSD fault? Then continue there!

Replace O2 sensor

Replace DME

Fault effect and breakdown warning

Driver information Warning light: MIL ON