2CA7 - P0155

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

2CA7 - P0155

Information saved in

DME

Fault code

2CA7 - P0155

Fault text

Oxygen sensor heating before catalytic converter 2, function

Fault description

O2 Sensor Heater Circuit (Bank 2 Sensor 1)

Condition for fault identification

Test condition:

Check O2 sensor heater; sensor too cold Terminal condition: Terminal 15, engine on Voltage condition:

none

Condition for fault memory entry

O2 sensor temperature < 680 锟斤拷C for more than 5 sec.

Action in service

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

Check wires (including resistance)

Check plug-in connections DME <=> Wiring harness

<=> Upstream (pre-cat) O2 sensor for Bank 2 (water or corrosion in the plug? => Repeatedly disconnect the plug and then FIRMLY press it back in)

Replace O2 sensor

Replace DME

Fault effect and breakdown warning

Driver information Warning light: MIL ON