P2247

128F01 - P2247

Information saved in
DME

Fault code
128F01 - P2247

Fault text
Oxygen sensor before catalytic converter 2, line fault: open
circuit, Nernst line

Fault description
The diagnostic function monitors oxygen sensor voltage
when the oscillator is deactivated.

Condition for fault identification
Test condition:
The fault is recognized when the sensor voltage is less than
0.2 V.
Potential problem source(s):
- Defect in wiring harness to pre-catalyst oxygen sensor 2
- Oxygen sensor 2 forward of catalytic converter defective
- Defective DME
Terminal condition: none
Voltage condition:
- None
Temperature condition:
- Engine temperature > 85 °C
Time condition:
- None
Other conditions:
- Engine on

Condition for fault memory entry
This fault is logged in the control module's fault memory if
it remains present for longer than 15 sec.

Action in service
- Defect in wiring harness to pre-catalyst oxygen sensor 2
- Replace pre-catalyst oxygen sensor 2
- Replace DME

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

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

Service instruction
none