FI errors only come from electrical problems with the fuel injection and ignition systems.
It's worse than that, the error codes can only blame electrically detected faults. Something external that caused one of the sensors to behave in an unusual way would be blamed on that sensor. The techs then read the code, see the named component, change it, then the wiring to it, then the ECU.
Used to happen all the time with ABS sensors. The code read "Sensor A value is outside expected limits". This was correct. The owner fitting oversized tyres had shifted what the sensor reported outside what the ECU could work with. The only components you could change to fit in would be the tyre, ABS polewheel or ECU programme. The tyre is the only one available off the shelf. I'm sure leaks and mechanical faults could upset FI sensors such as the flow meter in the same way.
If you do get an FI code my advice is to read the full text and consider what possibilities you can test, don't just start component swapping unless the code does list shorts or open circuits.
Andy