Question

I got the engine code P0456 on my 2007 Jeep Liberty Sport, I recently changed the spark plugs, could that be related?

Answer 1

I doubt the code is related to the spark plugs. The P0456 indicates a small leak in the Evaporative (EVAP) system. The most common problem for this code is a loose or damaged gas cap. Here is a link to the code page with more information about the code.

P0456 Jeep Code - EVAP System Small Leak
Read more: https://www.autocodes.com/p0456_jeep.html