P0051

2C9D - P0051

Information saved in
DME

Fault code
2C9D - P0051

Fault text
Oxygen sensor heating before catalytic converter 2,
activation

Fault description
HO2S Heater Control Circuit Low (Bank 2 Sensor 1)

Condition for fault identification
Test condition:
Driver circuit diagnosis for O2 sensor heater
UBatt > 10V
Sensors installed
No fault memories
Terminal condition: Terminal 15, engine on

Condition for fault memory entry
Active immediately after terminal 15 change; electr. faults
entered within a few seconds

Action in service
1. Visual inspection of wiring, DME plug and oxygen sensor
for damage
2. Check wiring
3. Inspect plug-in connections DME <=> Wiring harness
<=> Check oxygen sensor for Bank 2 before catalytic
converter
4. Replace oxygen sensor
5. Replace DME

Fault effect and breakdown warning


Driver information
Warning light:
MIL ON

Service instruction
none