2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 150
Information saved in
DME
Fault code
2C9C - P0030
Fault text
Oxygen sensor heating before catalytic converter, activation
Fault description
HO2S Heater Control Circuit (Bank 1 Sensor 1)
Condition for fault identification
Test condition:
Driver circuit diagnosis for O2 sensor heater
UBatt > 10V
Sensors installed
No fault memories
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
Active immediately after terminal 15 change; electr. faults
entered within a few seconds
Action in service
1. Visual inspection of wires, DME plug and O2 sensor for
damage
2. Check wires
3. Check plug-in connections DME <=> Wiring harness
<=> Upstream O2 sensor forward of catalyst for Bank 1
4. Replace O2 sensor
5. Replace DME
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON
Service instruction
none
2C9C - P0031 (DME)
2C9C - P0031
Information saved in
DME
Fault code
2C9C - P0031
Fault text
Oxygen sensor heating before catalytic converter, activation
Fault description
HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
Condition for fault identification
Test condition:
Driver circuit diagnosis for O2 sensor heater
UBatt > 10V
Sensors installed
No fault memories
Terminal condition: Terminal 15, engine on
