2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 147
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON
Service instruction
none
2C7E - P114A (DME)
2C7E - P114A
Information saved in
DME
Fault code
2C7E - P114A
Fault text
Oxygen sensor behind catalytic converter, trim control
Fault description
Post Catalyst Fuel Trim Via Oxygen Sensor System Too
Rich (Bank 1)
Condition for fault identification
Test condition:
O2 sensor trim control
No fault memories
Drive at 50 - 80 km/h and at moderate engine speed.
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
Excessive trim controller deviation; behind catalytic
converter sensor voltage outside range around trim
controller specification point with trim controller active
(approximately < 0.2 V or approximately > 0.9 V)
Action in service
This fault automatically triggers an active test (secondary
fault stored in the control module's fault memory!).
1. Read out results of active test (are other fault codes still
stored in the fault memory)? => Then continue at this point!)
2. Initiate system test for reversed O2 sensors. Follow
instructions for system test.
3. If the system test fails to produce a result then
4. Visual inspection of wiring and plugs
5. Electrical check of wiring
6. Replace wiring or plugs as indicated
7. Check exhaust system forward of downstream (post-cat)
O2 sensor for leaks
8. Replace downstream (post-cat) O2 sensor
9. Replace upstream (pre-cat) O2 sensor
10. Replace control module
Fault effect and breakdown warning
