Exhaust Gas Temperature Out of Range Bank 1 Sensor 1

Where it lives

For P2478, the part to look at first is the sensor named here. The description of P2478 puts it on bank 1.

Check these first

• A failed EGT sensor on bank 1 sensor 1
• A sensor 1 circuit with an open or short
• A blockage in the bank 1 exhaust
• A sensor 1 that is not seated or calibrated

What to do next

1. Read EGT sensor bank 1 sensor 1 on a scan tool
2. Compare sensor 1 to the other bank 1 EGT readings
3. Test the sensor 1 circuit for open and short faults
4. Check the bank 1 exhaust for a blockage
5. Replace the EGT sensor if it reads out of range against the others
6. Clear the code and retest

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