Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2011128I CONVERTIBLE (E88) L6-3.0L (N51)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONP CODE CHARTSP0141
2011 BMW 128i Convertible (E88) L6-3.0L (N51)
P0141
2011 BMW 128i Convertible (E88) L6-3.0L (N51)SECTION P0141
2CA8 - P0141
Information saved in
DME
Fault code
2CA8 - P0141
Fault text
Oxygen sensor heating behind catalytic converter, function
Fault description
O2 Sensor Heater Circuit (Bank 1 Sensor 2)
Condition for fault identification
Test condition:
Check internal resistance of O2 sensor to check sensor
heater => If the heater is too weak, the O2 sensor's internal
resistance rises too high (= sensor too cold)
No fault memories;
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
Internal resistance R > 12000 Ohm (US) or 15000 Ohm
(ECE)
Action in service
0. Was the temperature drop caused by external factors
(driving into snow pile, ice on O2 sensor?) Thaw sensor,
clear all fault memory, continue driving!
1. Check O2 sensor heater: Contact resistance on plugs and
in wiring is excessive (DME - wiring harness - sensor)
2. Check wiring
3. Check O2 sensor plug (water or corrosion in the plug?
Repeatedly disconnect the plug and then re-insert it
FIRMLY)
4. Replace plug and/or wire as indicated
5. Replace the affected downstream (post-cat) O2 sensor
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON
Service instruction
none
Information saved in
DME
Fault code
2CA8 - P0141
Fault text
Oxygen sensor heating behind catalytic converter, function
Fault description
O2 Sensor Heater Circuit (Bank 1 Sensor 2)
Condition for fault identification
Test condition:
Check internal resistance of O2 sensor to check sensor
heater => If the heater is too weak, the O2 sensor's internal
resistance rises too high (= sensor too cold)
No fault memories;
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
Internal resistance R > 12000 Ohm (US) or 15000 Ohm
(ECE)
Action in service
0. Was the temperature drop caused by external factors
(driving into snow pile, ice on O2 sensor?) Thaw sensor,
clear all fault memory, continue driving!
1. Check O2 sensor heater: Contact resistance on plugs and
in wiring is excessive (DME - wiring harness - sensor)
2. Check wiring
3. Check O2 sensor plug (water or corrosion in the plug?
Repeatedly disconnect the plug and then re-insert it
FIRMLY)
4. Replace plug and/or wire as indicated
5. Replace the affected downstream (post-cat) O2 sensor
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON
Service instruction
none
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.