41F7

41F7 - P2251

Information saved in
DDE

Fault code
41F7 - P2251

Fault text
DDE: Oxygen sensor, signal, virtual ground: Open circuit

Fault description
An open circuit failure in the virtual ground is recognized
when the signal voltage's resistance is above the threshold
3000 mV and the raw O2 value mV lies between -100 mV
and 100 mV.

Condition for fault identification
Test condition:
Check frequency is continuous in accordance with the
programmed time grid.
For activation of the open circuit error test at UN and VG all
of the following conditions must be satisfied:
- The sensor temperature is valid and continuously exceeds
the operating temperature for a period of 10 s.
The vehicle is not in overrun, debounce implemented with
100 ms and 100 ms.
The battery voltage is above 10700 mV, debounce
implemented with 0 ms and 2000 ms.
- No error related to low battery voltage at the chip or SPI
communications error is present.
- The hot oxygen sensor tests are enabled.
The current error status for open circuit error is registered as
soon as the Ri signal voltage debounced with 0 ms and 0 ms
exceeds the threshold 3000 mV.
After the period 2 s the open circuit error test is enabled for
the time 2000 ms.
Once 2000 ms has elapsed the test is again deactivated.
Voltage condition:
Check frequency is continuous in accordance with the
programmed time grid.
For activation of the open circuit error test at UN and VG all
of the following conditions must be satisfied:
- The sensor temperature is valid and continuously exceeds
the operating temperature for a period of 10 s.
The vehicle is not in overrun, debounce implemented with
100 ms and 100 ms.
The battery voltage is above 10700 mV, debounce
implemented with 0 ms and 2000 ms.
- No error related to low battery voltage at the chip or SPI
communications error is present.
- The hot oxygen sensor tests are enabled.
The current error status for open circuit error is registered as
soon as the Ri signal voltage debounced with 0 ms and 0 ms
exceeds the threshold 3000 mV.
After the period 2 s the open circuit error test is enabled for
the time 2000 ms.
Once 2000 ms has elapsed the test is again deactivated.

Condition for fault memory entry
Debounce (500 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