DTCS P0442 Or P0455: EVAP System Leak - Small Leak/Gross Leak: Condition

DTC P0442 is set when fuel tank pressure increase exceeds a predetermined value. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles.

DTC P0455 is set when difference between minimum and maximum fuel tank internal pressure is less than specified. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles.