4BAC

4BAC - P203A

Information saved in
DDE

Fault code
4BAC - P203A

Fault text
DDE: Reducing-agent active-tank fill-level sensor, signal:
Sensor fault

Fault description
Monitoring of active tank level sensor. The diagnostic
trouble code is logged when the physical sensor signal is
between 35 % and 45 %.

Condition for fault identification
none

Condition for fault memory entry
Debounce (2000 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Use the diagnostic system to check the fluid levels.
4. Replace the active tank.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Measure the resistance levels on the level sensor between
reference (pin 1) and tank level 1-3 (pins 2-4). The tank
must be empty for the measurement.
Nominal value with tank empty: 10 kOhm
Resistance levels in excess of 12 kOhms indicate a defective
fluid-level sensor.