Intake air temperature sensor upstream throttle
â–¶ How to fix
- Check lines of temperature sensor before throttle - Check plugconnection temperature sensor before throttle and EGC - Renew combined boost pressure temperature sensor
What you'll see
No driver-visible symptom recorded.
System reaction
- Vehicle starts badly or doesnt start at all - Engine runs badly - Torque is limited
Diagnostic depth
Detection
- Sensor signal above threshold - wtfa1_w > WTFA1MX
Possible cause
- Voltage of boost air temperature sensor too high - Intake air temperature sensor defect - Short circuit to battery