The general meaning of the automobile dictionary meaning of the engine P278A Code is not helpful. Do not allow wrong meaning for solving the car engine. The automobile meaning of the code is found online and it means that P for OBD-II Diagnostic Powertrain (P) Trouble Code For Engine. 2 for Fuel And Air Metering (Injector Circuit Malfunctions Only). 7 for Engine Oil Temperature Sensor Malfunction. 8 for Cylinder 10 Contribution/balance Fault and A for Exhaust Gas Recirculation Sensor B Circuit High. You must not use any other meaning of the code for solving the car engine. Any wrong meaning is not correct for solving the car engine.