P2196

2C49 - P2196

Information saved in
DME

Fault code
2C49 - P2196

Fault text
Oxygen sensor before catalytic converter, plausibility

Fault description
O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 1)

Condition for fault identification
Test condition:
Comparison of before cat./behind cat. O2 sensor signals:
Sensor before cat. rich and sensor behind cat. lean
Diagnosis conditions:
- Active lambda control before cat.
- Sensor behind cat. ready for operation and checked
- Partial trim control (with sensor behind cat. active) active
Terminal condition: Engine running
Voltage condition:
battery voltage<11V oder Ubatt > 16 volts

Condition for fault memory entry
If exhaust system mass airflow integration fault conditions
are present, until threshold value is reached
Fault criterion:
Lambda < 0.90 (rich) and U_cat-back sensor < 0.15V (lean)

Action in service
1. LSU-replace O2 sensor
2. Repair exhaust system leak
3. Check wiring harness

Fault effect and breakdown warning


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

Service instruction
none