The meaning of the P0034 Code is available online but do not use those meaning for solving the car engine problem. The meaning of the code is found online but without knowing the manufacturer meaning of the code do not think to solve the engine problem. The engine code P0034 OBD2 may also be activated by faults former down the line. So, a dirty MAF sensor might be producing the car to overreact in its fuel-trim changes. As a result, oxygen sensors are likely to account fuel blend problems. Extreme air inflow can be produced by a vacuum leak, a dirty sensor or, an finish gas recirculation valve not final properly.