A failed Air Fuel Ratio sensor can also cause these symptoms and fuel trim readings. (mechanics.stackexchange.com)
It's quite simple if we can treat each fuel and its stoichiometric air fuel ratio separately, but when it turns to flex fuel cars I can't get a conclusion. (mechanics.stackexchange.com)
However, could it be that the AFM data will be used to provide the correct air fuel ratio, as long as the AFM data is not obviously incorrect? (mechanics.stackexchange.com)