The error P284C Code has a right and wrong meaning but it depends on the manufacturer. The meaning of the code of your car manufacturer is correct meaning and you can use that meaning for solving the car engine. The automobile meaning of the code is not correct meaning for solving the car engine. The automobile dictionary meaning of the code is P for OBD-II Diagnostic Powertrain (P) Trouble Code For Engine. 2 for Fuel And Air Metering or Injector Circuit Malfunctions Only. 8 for Engine Oil Temperature Sensor Malfunction. 4 for Cylinder 10 Contribution or balance Fault and C for Exhaust Gas Recirculation Sensor B Circuit High.