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P2478
Exhaust Gas Temperature Out of Range Bank 1 Sensor 1
Generic · emissions
Data confidence
85%
The control module detected that the Exhaust Gas Temperature value was outside the valid range.
TuningBot DTC Database · v4.37.15
P2478 Exhaust Gas Temperature Out of Range Bank 1 Sensor 1
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P2478 means
Related and nearby codes
How to read P2478
P
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
478
Specific fault index within the subsystem.
Frequently asked questions about P2478
What does P2478 mean?
Exhaust Gas Temperature Out of Range Bank 1 Sensor 1. The control module detected that the Exhaust Gas Temperature value was outside the valid range.
Is P2478 generic or manufacturer-specific?
P2478 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2478 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic