The engine B2234 Code has different menaings based on the model and manufacturer of the car. Do not use the dictionary menaing for solving the car engine problem. The general meaning of the code is not every thing. The code B2234 OBD2 may also be activated by faults previous down the line. For example, a dirty MAF sensor might be producing the car to overreact in its fuel-trim adjustments. So, oxygen sensors are probable to report fuel combination problems. You need to remove the problem from the car engine and it is possible when you get the real emaning of the code.