The engine P1522 code may also be activated by liabilities past down the line. Such as, a dirty MAF sensor might be beginning the car to overreact in its fuel-trim adjustments. So, oxygen sensors are likely to account fuel combination problems. You should check the engine list and the list is Manifold Absolute Pressure/Barometric Pressure Circuit High Input, Turbocharger Boost Sensor A Circuit Low and Glow Plug/Heater Circuit ‘A’ Malfunction. Solve the car engine problem fast and once the car engine is ok, you can take the car for a test drive. Do not fix the car engine by yourself if you do not know how to fix the car engine problem.