The code B1405 comes for problem of engine and it is necessary to solve the problem before anything goes wrong. The code B1405 OBD2 triggers by the fault of engine’s earlier down the line. Suppose, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors make a report of fuel mixture problems. The code comes for emissions-related vehicle overhaul is that any change that changes the vehicle from a specialized shape to a non-certified formation is measured meddling. You should read the manual for solving the problem properly from engine.