P203B

4BAD - P203B

Information saved in
DDE

Fault code
4BAD - P203B

Fault text
DDE: Reducing-agent active-tank fill-level sensor,
plausibility: Plausibility error

Fault description
Plausibility check on active tank level sensor. When the
physical sensor signal falls below the limit value 35 % the
signal is classified as implausible and the diagnostic trouble
code is logged.

Condition for fault identification
none

Condition for fault memory entry
Debounce (15000 ms)

Action in service
- If the reduction agent is frozen: Allow the active tank to
thaw. Delete the diagnostic trouble code from the ECU.
- If the reduction agent is not frozen:
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Use diagnostic system to check fluid level in active tank.
4. Check to determine whether DTC 4BAB is present.
Repair this first.
5. Replace the active tank.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
In winter: Allow the tank to thaw. Check level. Delete the
diagnostic trouble code from the ECU.
If the DTC 4BAB is present at the same time it must be
repaired first.