SOURCE: po456 evaporative emission system leak--- check
Check your gascap, make sure it is tight. Check your PCV valve and look at large hoses going to a canister. This code means you are not getting the proper vacuum in the system that vents your gastank or engine.
P0305....Cylinder 5 Misfire Detected
P0442....Evaporative Emission Control System Leak Detected (small leak)
P0455....Evaporative Emission Control System Leak Detected (gross leak)
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