The error P284B Code has a meaning and you must look for the correct meaning of the code solving the car engine. The automobile dictionary meaning of the code is not used for solving the car if you know the primary meaning of the code. 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 B for Exhaust Gas Recirculation Sensor B Circuit High. You should test the car by a test drive before receiving the car.