The car engine P2128 Code helps the automobile engineer to know the problem and fix the car engine. Without meaning of the code, you cannot know the problem. In some cases, the car engine can be fixed at the cheap rate and you do not need to add or remove any component. The car engine P2128 DTCs may also be activated by faults previous down the line. For example, a dull or useless MAF sensor might be causing the car to overreact in its fuel-trim changes. So, oxygen sensors are possible to report fuel combination difficulties. Fixing the car engine is very essential.