BMW 328i Sedan (E90) L6-3.0L (N51) P code charts 46
2F9A - P0070
Information saved in
DME
Fault code
2F9A - P0070
Fault text
Ambient temperature sensor, communication
Fault description
Ambient Air Temperature Sensor Circuit
Condition for fault identification
Test condition:
Ambient temperature sensor signal communications monitor
Terminal condition: Terminal 15 ON
Voltage condition:
none
Condition for fault memory entry
22 sec.
Action in service
1) Visual inspection of sensor
2) Electrical check on sensor wire and power wires
3) Sensor replacement
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON in US versions only
Service instruction
none
P0071
2F99 - P0071
Information saved in
DME
Fault code
2F99 - P0071
Fault text
Ambient temperature sensor, plausibility
Fault description
Ambient Air Temperature Sensor Range/Performance
Condition for fault identification
Test condition:
PLAUS
Terminal condition: no invariable debounce time, constant
sensor data reading during engine warm-up produces entry
Voltage condition:
Terminal 15 ON
Condition for fault memory entry
Plausibility monitoring of ambient temperature sensor with
end of start phase recognized
Action in service
Constant, invariable sensor signal:
Sticking sensor, sensor manipulation
