P0131

2C3F - P0131

Information saved in
DME

Fault code
2C3F - P0131

Fault text
DME, internal fault: oxygen sensor, evaluation module

Fault description
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

Condition for fault identification
Test condition:
Monitoring of O2 sensor chip
No fault memories
Terminal condition: Terminal 15, engine on
Voltage condition:
none

Condition for fault memory entry
Short to ground in self-diagnosis processor chip

Action in service
1. Visual inspection of wires, DME plug and O2 sensor for
damage
2. Check wires
3. Check plug-in connections DME <=> Wiring harness
<=> Upstream (pre-cat) O2 sensor for Bank 2
4. Check wiring harness for shorts to positive or ground and
shorts/shunt to other bank (melted?) => Replace wiring
harness
5. Replace O2 sensor
6. Replace DME

Fault effect and breakdown warning


Driver information
Warning light:
MIL ON

Service instruction
none