2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 114
Driver information
Warning light:
none
Service instruction
none
(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
1. Visual inspection of wires, DME plug and O2 sensor for
damage
2. Check wires (including resistance)
3. 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)
4. Replace O2 sensor
5. Replace DME
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON
Service instruction
none
2CA7 - P166F (DME)
2CA7 - P166F
Information saved in
DME
Fault code
2CA7 - P166F
Fault text
Oxygen sensor heating before catalytic converter 2, function
Fault description
Internal Control Module Measurement Error Oxygen Sensor
