P2626

128E08 - P2626

Information saved in
DME

Fault code
128E08 - P2626

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

Fault description
The diagnostic function monitors the pre-catalyst oxygen
sensor.

Condition for fault identification
Test condition:
The fault is recognized when the oxygen sensor before the
catalytic converter fails to transmit a signal.
Potential problem source(s):
- Defective wiring harness
- Oxygen sensor before catalytic converter defective
- Defective DME
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:
- None
Other conditions:
- Engine on
- Vehicle underway
- Pre-catalyst oxygen sensor heated to adequate temperature
- Overrun mode

Condition for fault memory entry
600 sec. if the tank is not confirmed full

Action in service
- Check wiring harness between pre-catalyst oxygen sensor
and DME
- Replace pre-catalyst oxygen sensor
- Replace DME

Fault effect and breakdown warning
Breakdown notice:
Continued driving is possible, but because the oxygen
sensor is not ready for closed-loop control, conversion of
exhaust gases in the catalytic converter will be seriously
impaired.
Possible apparent symptoms:
- MIL lamp lights up after 2nd driving cycle
- Higher exhaust emissions
- Higher fuel consumption
- Surge

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