2010 BMW 128i Convertible (E88) L6-3.0L (N52K) P Code Charts
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(DME) Condition For Fault Memory Entry – 1
2CA7 – P0155
Information saved in
DME
Fault code
92
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 掳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
