P0456 Mitsubishi -

Question

I got p0456 for both codes, does that mean its on both sides of the engine? I replaced the gas cap.

Answer 1

P0456 Evaporative emission system leak detected (small leak)

This code is for the evaporative emission , replacing the gas cap is the first step ensuring that the gas cap is properly set is the next step. When you get this code this means there is a fuel vapor leak at the fuel tank are or the charcoal canister which store fuel vapors.