Manufacturer Code Charts: 128901

128901 - P0133

Information saved in
DME

Fault code
128901 - P0133

Fault text
Oxygen sensor before catalytic converter, dynamic
response: slow response

Fault description
The diagnostic function monitors the amplitude ratio of the
lambda signal during forced stimulation.

Condition for fault identification
Test condition:
The fault is recognized when attenuation of the amplitude
ratio rises above 0.9
Potential problem source(s):
- Oxygen sensor before catalytic converter defective
- Oxygen sensor behind catalytic converter defective
- Defect in wiring harness to oxygen sensor behind catalytic
converter
Terminal condition: Terminal 15
Voltage condition:
- None
Temperature condition:
- Engine temperature > 85 °C
Time condition:
- None
Other conditions:
- Drive at 50 - 80 km/h and moderate rpm
- 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 400 sec.

Action in service
- Check wiring harness to oxygen sensors
- Replace pre-catalyst oxygen sensor
- 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
- US emissions warning lamp: on
- ECE electronic engine power reduction: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
- none