The analysis code B1224 has different meanings and it depends on the company of the cars and models of the cars. To get the meaning of the code B1210, it is necessary to know the model and manufacturer. The dictionary meaning of the B1224 Code is B for body code, 1 for MFG, 2 for Computer and Auxiliary Outputs, 1 for IC Circuit High Voltage and 2 Kick-Down Switch Failed Short. Too much air inflow can be the reason by a vacuum leak, a dirty sensor, a finished gas recirculation valve not closing appropriately. The lean fuel mix mistake may be attended by engine misfires, rough idling, hesitation etc.