So long story short my car is running completely fine with no misfires except its throwing a p0204/injector 4 circuit malfunction. I have checked everything top to bottom and it all checks out. Good voltage, good amp draw good resistance in the injectors themselves. I checked all 4 injectors on the oscilloscope all have a normal wave form. Moved injectors around and even checked pin tension on all connectors. If I clear the code with the engine running it will stay off. However, if I turn it off and back on the code comes back almost instantly. Unfortunately, the only thing left is the ECU. Maybe a faulty driver on the ECUs injector 4 circuit. Who knows I'm out of ideas. Anyone ever heard or seen anything like this?