P2247

2C51 - P2247

Information saved in
DME

Fault code
2C51 - P2247

Fault text
DME2: Oxygen sensor before catalytic converter, bank 2,
Nernst line

Fault description
Pre-catalyst oxygen sensor, Nernst cable

Condition for fault identification
Test condition:
Monitoring on missing Nernst voltage wire (UN);
Diagnosis conditions:
- No fault recognized on O2 sensor heater driver circuit
- O2 sensor voltage in implausible range (Ua < 0.2 V or >
4.7 V
Terminal condition: Engine running
Voltage condition:
battery voltage<11V oder Ubatt > 16 volts

Condition for fault memory entry
Fault monitoring criterion must remain present over 1 sec.

Action in service
Check plug / wiring harness / O2 wiring, otherwise replace
O2 sensor

Fault effect and breakdown warning
none

Driver information
Warning light:
MIL on in 2nd DC

Service instruction
none