P0456 is a very small EVAP leak. That means the leak is not something you are going to see with your eyes as it is.020" For a visual of what.020 looks like the hole in this letter- o -is larger than.020".
It can be virtually anywhere in the EVAP system. Resetting the code does nothing. You need to have a smoke machine connected and then look hard for the tiny leak. It could be under a flake of rust or at a hose connection or inside a valve. The reason the car hesitates is because clearing the codes does more than erase that one code, it also resets the engine computer so it has to relearn some of the data it needs to run.
Sunday, February 4th, 2018 AT 5:12 PM