P3027

2CA1 - P3027

Information saved in
DME

Fault code
2CA1 - P3027

Fault text
Oxygen sensor heating before catalytic converter 2

Fault description
O2 Sensor Operating Temperature not Reached (Bank 2
Sensor 1)

Condition for fault identification
Test condition:
Monitoring of sensor ceramic temperature and control signal
pulse-duty factor detects reduced heater performance at
oxygen sensor before cat. (no defect in heater wiring)
Diagnosis conditions:
- No overrun cutoff
- Exhaust-gas temperature > 400 �C
- No other O2 sensor faults
Terminal condition: Engine running
Voltage condition:
battery voltage<11V oder Ubatt > 16 volts

Condition for fault memory entry
40 sec.

Action in service
Check plug, replace sensor

Fault effect and breakdown warning


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

Service instruction
none