Ambient Air Temperature 1, Sensor Plausible Low.
Compare the temperature between the ambient temperature sensors (AAT1, AAT2 and T202/T126) Check the wiring and the connectors to the ambient temperature sensor (AAT1) Change the ambient temperature sensor (AAT1) 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 if the engine is equipped with EGR system.
System reaction
No system-reaction text recorded.
Diagnostic depth
The ambient temperature is lower compared to the other ambient temperature sensor (AAT2) and to the temperature sensor in the air inlet (T202 or T126).
* The ambient temperature sensor (AAT1) is faulty * The ambient temperature sensor (AAT1)has been exposed to unusually low temperature compared with the other temperature sensors.