The code B1225 is used for engine code and when the engine shows the code, it is necessary to check the manual of the code. Otherwise, it is not possible to know the meaning of the code. The code may appear for different reasons. The B1225 OBD2 also appears by faults previous down the line. Suppose, a dirty MAF sensor might be producing the car to overreact in its fuel-trim alterations. For this reason, oxygen sensors are likely to report fuel mixture difficulties. The excessive air inflow can be caused by a dirty sensor or a used gas recirculation valve not closing correctly or a vacuum leak.