The automobile dictionary meaning of the engine P0494 Code is P for OBD-II Diagnostic Powertrain (P) Trouble Code For Engine. 0 for Intake Valve Control Solenoid Circuit Low. 4 for Engine Oil Temperature Sensor Malfunction. 9 for Cylinder 10 Contribution/balance Fault and 4 for Reverse Input Circuit. You will get some other meanings of the code what are not related with the car. Suppose, you will get meaning of the code from other car manufacturers. Those meanings may not right for solving your car engine. Do not drive the car if the car engine is not solved or fixed. You may face more problem in the car engine for using the wrong meaning of the code.