Ambient Air Temperature 1 (T27), 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 (T27) Change the ambient temperature sensor (T27) 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 (T27) is higher compared to the other ambient temperature sensor (AAT2) and to the temperature sensor in the air inlet (T202 or T126).
* The ambient temperature sensor (T27) is faulty * The sensor has been exposed to unusually high temperature compared to the other temperature sensors.