Manufacturer Code Charts: 128008

128008 - P0040

Information saved in
DME

Fault code
128008 - P0040

Fault text
Oxygen sensors before catalytic converter, mounting: mixed
up

Fault description
The diagnostic function monitors the lambda controller.

Condition for fault identification
Test condition:
The fault is recognized when the lambda controller on one
bank is above 25 % and simultaneously below -25 % on the
other bank.
Potential problem source(s):
- Oxygen sensors before catalytic converter interchanged.
Terminal condition: none
Voltage condition:
- None
Temperature condition:
- Engine temperature > 85 °C
Time condition:
- None
Other conditions:
- Engine on
- No additional diagnostic fault codes logged

Condition for fault memory entry
This fault is logged in the control module's fault memory if
it remains present for longer than 50 sec.

Action in service
- Inspect pre-catalyst oxygen sensor for correct installation

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