#10194, "RE: CEL code P0107 fuel trim (bank 1)" In response to In response to 0
i threw that code in my 420a when i installed my turbo kit. my 02 sensor was bad, after i replaced that it fixed my code. i didn't understand it either. i did exactly what you did by richening up the car and got the same results. i'm not sure if the 02 sensor was at fault since i'm still tuning.