The engine P266C Code gives information of the car engine problem. The engine code is related with the powertrain problem and you needs to solve the powertrain problem as fast as possible 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 (Injector Circuit Malfunctions Only). 6 for Engine Oil Temperature Sensor Malfunction. 6 for Cylinder 10 Contribution/balance Fault and C for Exhaust Gas Recirculation Sensor B Circuit High. However, if you do not know correct meaning of the code and do not know the process of solving the car, you should not try to fix the car engine.