Anti in my car before. poll. I had the error because of the lpg, then I turned off the engine lamp with the obd2 device, it was not lit for about 2 months, but yesterday the vehicle was working on the first gasoline, it was still lit, when I look at it from the obd2 system too lean bank 1 warning, I think the oxygen is too low, the oxygen in the first engine Although I deleted the error in the sensor again, it repeats again, whether it is due to the poor mixture or if it might cause another problem, it was 2 days.