I'm new to owning my 2013 G37 mt but I've been keeping up with it but just recently I got the engine code P0456 and its saying its the Evap pressure sensor or loose/damaged gas cap.
havent replaced the cap but plan on ordering an oem soon
however if thats not the case where is the sensore located?

any help is appreciated thank you

 

before you do all that, that code usually is just that the gas cap has come loose...unscrew it, screw it back on properly and drive for a day or two and it should go away...if not then move onto replacing the cap and looking at sensors...

 

^^^ Good advice.

The next common failure (actually leak) is the vent valve on the charcoal canister.

 

The fuel line rusts out. It's behind the frame and there's a bracket that holds is and it rusted out on mine and thats where the leak is. The valve purge is a simple check with and if it moves it works and for the gas cap it only leaks when you don't hear this hiss when you fuel up. So check the fuel line and see if it's rusted. If so be ready for a hard time