Boost temp sensor (T121)
â–¶ How to fix
Read the boost temperature sensor (T121) measurements. When the engine is under load, the temperature should rise. Check the sensor, connectors and electrical wiring. If no errors are found, replace boost temperature sensor
What you'll see
No driver-visible symptom recorded.
System reaction
The engine performance could be affected. There is risk for black smoke.
Diagnostic depth
Detection
The value from the boost temperature sensor show a static value but operating conditions show that it should vary
Possible cause
- Faulty sensor ( T121) / sensor installation - Connector and wiring harness