Expert Insights Understanding and Resolving the P0456 Engine Code

The code is P0456 (EVAP/Emissions related to the purge valve.) No issues otherwise during my ~3k miles of ownership. Scanned the code as P0456 very small evaporator emissions leak. I checked for any obvious cracking in any hoses, and took out the purge valve to check it. Looking for information on how you have fixed this error code on your Mini CooperS 2014. Have already reseated the gas cap. Didn't turn off the Check engine ... Need Help - Code P0456 EVAP Emission Control System Leak (very small). Jump to Latest. 51K views 15 replies ... My 2003 LS430 base model is throwing code P0456 "evaporative emission system leak detected (very small)". The VSC and check engine light also came on. P0456 is an OBD-II generic code that the engine control module (ECM) has detected a very small leak in the evaporative system during the vehicle off testing. Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this ... 2009 - 2014 Ford F150 - P0456 - Check Engine Code - P0456 - Check Engine Code - Small EVAP leak. I am going to assume this is coming from ... The P0456 error code indicates your EVAP system is leaking fuel vapor. The code further designates the leak as very small. It can be other than the gas cap. The cap is most common and not tight enough is the most common reason. Make sure when tightening the cap to ...