The engine P284D Code gives some information of the car engine problem and it is significant thing for the automobile engineer for solving the car engine. If the correct meaning of the code is followed, new problem may start. 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 (Injector Circuit Malfunctions Only). 8 for Engine Oil Temperature Sensor Malfunction. 4 for Cylinder 10 Contribution or balance Fault and D for Exhaust Gas Recirculation Sensor B Circuit High. Do not drive the car with the car engine problem and fix it as soon as possible.