You should test the car engine and find the real cause of the car engine problem what is related with the car engine P0461 Code. The car engine code is meaningless if right meaning of the code is not used. You should not allow any false meaning or automobile dictionary meaning what is found online easily. You can check the car engine according to check list and those are fuel Composition Sensor Circuit Malfunction, Cylinder 1 Injector Circuit Low and Crankshaft Position Sensor B Circuit Malfunction. Do not drive the car with the engine problem. Because a minor engine problem can trigger serious problem in the car engine.