P0131

4226 - P0131

Information saved in
DDE

Fault code
4226 - P0131

Fault text
DDE: Oxygen sensor: Signal voltage too low

Fault description
The diagnostic trouble code is logged in the ECU when the
raw voltage signal for the O2 ratio falls below the limit
value 300 mV during normal operation.

Condition for fault identification
Test condition:
The following conditions must be present for the error
check:
- The O2 calibration is not active.
- Oxygen sensor heater is active.
- No demand for thermal regeneration may be present and
the engine must remain in this condition for a period of
10000 ms.
Voltage condition:
The following conditions must be present for the error
check:
- The O2 calibration is not active.
- Oxygen sensor heater is active.
- No demand for thermal regeneration may be present and
the engine must remain in this condition for a period of
10000 ms.

Condition for fault memory entry
Debounce (1000 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
Replace oxygen sensor.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none