You should verify the cause of the engine to know the cause of the engine P0268 Code and it is necessary to know reason of the car engine problem. The automobile meaning of the engine is found online and it is P for OBD-II Diagnostic Powertrain (P) Trouble Code For Engine. 0 for Intake Valve Control Solenoid Circuit Low. 2 for Engine Oil Temperature Sensor Malfunction. 6 for Cylinder 10 Contribution/balance Fault and 8 for Exhaust Gas Recirculation Sensor B Circuit High. The problem can be fixed at the lower rate and it may not necessary to change the car engine problem.