P2243

2C51 - P2243

Information saved in
DME

Fault code
2C51 - P2243

Fault text
Oxygen sensor before catalytic converter, Nernst cable

Fault description
O2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor
1)

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


Driver information
Warning light:
MIL on (in 2nd driving cycle);

Service instruction
none