The automobile dictionary meaning of the engine P279C Code is not very important thing but many people like to use the code meaning for solving the car engine. Do not allow any meaning of the code for solving the car engine. The general 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). 7 for Engine Oil Temperature Sensor Malfunction. 9 for Cylinder 10 Contribution/balance Fault and C for Exhaust Gas Recirculation Sensor B Circuit High. When the car is fixed, then take car for a test drive.