Ambient Air Temperature 2 (T163), sensor plausible high.
Compare the temperature between the ambient temperature sensors (T27, T163 and T202/T126) Check the wiring and the connectors to the ambient temperature sensor (T163) Change the ambient temperature sensor (T163) To verify the repair run the vehicle above 30km/h for 2 minutes.
What you'll see
The system may shut off the EGR system at low measure ambient temperatures.
System reaction
No system-reaction text recorded.
Diagnostic depth
The ambient temperature is higher compared to the other ambient temperature sensor (AAT1) and to the temperature sensor in the air inlet (T202 or T126).
* The ambient temperature sensor (T163) is faulty * The sensor has been exposed to unusually high temperature compared to the other temperature sensors.