12BD33

12BD33 - P0139

Information saved in
DME

Fault code
12BD33 - P0139

Fault text
Oxygen sensor after catalytic converter, ageing: voltage
threshold not reached

Fault description
The diagnostic function monitors the voltage of the oxygen
sensor behind the catalytic converter on overrun.

Condition for fault identification
Test condition:
The fault is recognized when the voltage of the oxygen
sensor behind the catalytic converter falls too slowly during
trailing throttle/overrun operation.
Potential problem source(s):
- Defect in wiring harness between DME and oxygen sensor
behind catalytic converter
- Oxygen sensor behind catalytic converter defective
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- Engine warmed to normal temp, above 80 °C
Time condition:
- At least 10 sec. in overrun phase
Other conditions:
- Engine in overrun mode

Condition for fault memory entry
This fault is logged in the control module's fault memory
immediately.

Action in service
- Inspect wiring harness between oxygen sensor behind
catalytic converter and DME
- Replace oxygen sensor behind catalytic converter

Fault effect and breakdown warning
Breakdown notice:
- none
Possible apparent symptoms:
- none

Driver information
Warning light:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: on
- CC message: on
- US emissions warning lamp: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
- none