P2243

2C3D - P2243

Information saved in
DME

Fault code
2C3D - P2243

Fault text
Oxygen sensor before catalytic converter, line fault

Fault description
O2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor
1)

Condition for fault identification
Test condition:
O2 sensor wiring monitor (heater)
O2 sensor temperature is too low and the sensor signal is
implausible
No fault memories
Terminal condition: Terminal 15, engine on
Voltage condition:
none

Condition for fault memory entry
Sensor temperature < 680 °C and sensor voltage < 0.2 V
with oscillator deactivated

Action in service
1. Visual inspection of wires, DME plug and O2 sensor for
damage
2. Inspect wires
3. Check plug-in connections DME <=> Wiring harness
<=> Upstream (pre-cat) O2 sensor for Bank 1 (water or
corrosion in plug?) => Repeatedly disconnect the plug and
then FIRMLY press it back in)
4. Replace O2 sensor
5. Replace DME

Fault effect and breakdown warning


Driver information
Warning light:
MIL ON

Service instruction
none