P0420

180001 - P0420

Information saved in
DME

Fault code
180001 - P0420

Fault text
Catalytic converter: efficiency below limit value

Fault description
The diagnostic function monitors the ability of the catalytic
converter to store oxygen.

Condition for fault identification
Test condition:
The fault is recognized when the catalytic converter loses
the ability to store sufficient levels of oxygen.
Potential problem source(s):
- Collateral fault stemming from defective oxygen sensor or
mixture adaptation fault
- Leak in exhaust system
- Catalytic converter defective
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

Condition for fault memory entry
This fault is logged in the control module's fault memory
immediately.

Action in service
- If faults related to the oxygen sensor or mixture adaptation
have been logged, repair these first (collateral fault)
- Check exhaust system for leaks
- If the fault is continuously present or has multiple log
entries respond by replacing the 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