Hello. Can anyone help in the initial diagnosis of the fault? As in the subject, we have Toyota Yaris 1.0, 2003 with LPG installation (the problem occurs on gasoline and gas). It displays two errors P0171 and P0301. The engine is very weak, works unevenly as if it did not work on one cylinder or had a different ignition. Of course, today I'm going to the mechanic but I want to know what to expect so that it does not turn out that the mechanic will tell me that you need to replace half the car. I am asking for a diagnosis.
