2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 170
Mass airflow exceeds 10 kg/h
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
Bank 2 downstream (post-cat) O2 sensor voltage less than
0.02 V; internal resistance in circuit for downstream oxygen
sensor less than 10 ohms
Action in service
1. Check wiring
2. Check plugs
3. Resistance measurement
4. Measure voltage
5. Replace Bank 2 downstream (post-cat) O2 sensor
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON
Service instruction
none
2C77
2C77 - P0140
Information saved in
DME
Fault code
2C77 - P0140
Fault text
Oxygen sensor behind catalytic converter, signal
Fault description
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
Condition for fault identification
Test condition:
O2 sensor signal test
No fault memories
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
O2 sensor voltage between 0.4 V and 0.5 V;
internal resistance in downstream oxygen sensor's circuit
exceeds 60 kOhms
Action in service
1. Visual inspection of wiring and plugs
2. Measure resistance
3. Replace affected wire
4. Replace wiring harness
5. Replace O2 sensor
Fault effect and breakdown warning
