Manufacturer Code Charts: 4709

4709 - P204C

Information saved in
DDE

Fault code
4709 - P204C

Fault text
DDE: Reducing-agent pressure sensor, signal: Open or short
circuit to ground

Fault description
Urea pressure sensor monitoring function. The diagnostic
trouble code is logged when the raw sensor signal (voltage)
is less than the specified lower limit 350 mV.

Condition for fault identification
Test condition:
The test routine is executed only provided that no other
electrical faults are present.
Voltage condition:
The test routine is executed only provided that no other
electrical faults are present.

Condition for fault memory entry
Debounce (400 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Check pressure sensor.
4. Replace delivery module.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
When no pressure is present the sensor transmits a signal of
500 mV. If the value is not transmitted then the sensor or the
power supply is defective.
For access reasons, start by checking wires between transfer
plug and DDE (E70: behind the front bumper, E90: behind
left rear wheel).