Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
178
Specific fault index within the subsystem.
Frequently asked questions about P2178
What does P2178 mean?
System too rich off idle, bank 1. The control module detected that the air-fuel mixture stayed richer than the target despite full corrective control (System).
Is P2178 generic or manufacturer-specific?
P2178 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2178 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.
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