2F99

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

Fault effect and breakdown warning


Driver information
Warning light:
1) Visual inspection of sensor
2) Electrical check on sensor wire and power supply wire
2) Check sensor data response to motion
3) Replace sensor

Service instruction
none