Manufacturer Code Charts: 4507

4507 - P0402

Information saved in
DDE

Fault code
4507 - P0402

Fault text
DDE: Exhaust-gas recirculation, control deviation: Air mass
too low/positive control deviation

Fault description
The diagnostic trouble code is logged in the ECU when the
exhaust-gas recirculation system's positive control deviation
exceeds a limit defined based on the operating point.

Condition for fault identification
Test condition:
The test runs every 20 ms when the exhaust-gas
recirculation system is activated, the monitoring system is
enabled and no other system fault is present.
The test conditions must be satisfied for at least 0 ms.
Voltage condition:
The test runs every 20 ms when the exhaust-gas
recirculation system is activated, the monitoring system is
enabled and no other system fault is present.
The test conditions must be satisfied for at least 0 ms.

Condition for fault memory entry
Debounce (4000 ms)

Action in service
Check the following potential problem sources:
1. Leaks in mass airflow system between the mass-airflow
sensor and the compressor.
2. Contaminated air filter.
3. Defective mass-airflow sensor.
4. Swirl valves sticking in closed position.
5. Carbon deposits on intake valves.
6. Defective throttle valve (in combination with throttle
valve faults).
7. Defective EGR valve (in combination with EGR valve
faults).
8. Defective turbocharger (in combination with turbocharger
faults).
Applies to engines with single-stage boost: Conduct mass
airflow system test.

Fault effect and breakdown warning
It is possible to continue driving the vehicle, emissions
deteriorate.
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL_SVS

Service instruction
Note collateral effects with boost-pressure control. Problems
related to EGR can affect the boost-pressure control.