2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 168
O2 Sensor Circuit High Voltage (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
Voltage on Bank 1 O2 sensor behind catalytic converter
greater than 4.6 V
Action in service
1. Check wiring
2. Measure downstream (post-cat) O2 sensor voltage
3. Check plug
4. Replace Bank 1 downstream (post-cat) O2 sensor
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON
Service instruction
none
2C74
2C74 - P0158
Information saved in
DME
Fault code
2C74 - P0158
Fault text
Oxygen sensor behind catalytic converter 2, signal
Fault description
O2 Sensor Circuit High Voltage (Bank 2 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
Voltage on Bank 2 O2 sensor behind catalytic converter
greater than 4.6 V
Action in service
1. Check wiring
2. Measure downstream (post-cat) O2 sensor voltage
3. Check plug
4. Replace Bank 2 downstream (post-cat) O2 sensor
Fault effect and breakdown warning
