Error code
OBD2 P2278
OBD2P2278
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
O2 Sensor Signals Swapped Bank 1 Sensor 3 / Bank 2 Sensor 3.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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