12AF08

12AF08 - P013E

Information saved in
DME

Fault code
12AF08 - P013E

Fault text
Oxygen sensor after catalytic converter, trailing throttle,
from rich to lean: delayed response

Fault description
The diagnostic function monitors response lag/aging in the
oxygen sensor behind catalytic converter.

Condition for fault identification
Test condition:
The fault is recognized when the dynamic signal from the
post-catalyst oxygen sensor displays excessive lag.
Potential problem source(s):
- Defective wiring harness
- Oxygen sensor behind catalytic converter defective
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- None
Time condition:
- None
Other conditions:
- Engine in overrun phase 5 times

Condition for fault memory entry
The diagnostic fault code is logged once the fault appears
five times.

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