2C4E - P3021 (DME)

2C4E - P3021

Information saved in
DME

Fault code
2C4E - P3021

Fault text
Oxygen sensor before catalytic converter 2, pump current
cable

Fault description
O2 Sensor Signal Voltage Too Low during Coast Down
Fuel Cut-Off due to Open Pumping Current Circuit (Bank 2
Sensor 1)

Condition for fault identification
Test condition:
Monitoring on disconnected pump current wire (IP);
Diagnosis conditions:
- Overrun cutoff present for at least 3 min.
- Voltage on CJ125 < 1.7 V
- Sensor heated adequately
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 2 sec.

Action in service
Check plugs/wiring harness, otherwise replace sensor

Fault effect and breakdown warning


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

Service instruction
none