I have a 1998 Jeep Grand Cherokee Laredo Limited V6 and the po455 code showed. My husband already changed the fuel cap. we don't know what to do next. it also had a po442 small code, can you tell me what that is
P0445 Evaporative monitor large leak detected
P0442 Evaporative monitor small leak detected
This is for the evap system obviously the EVAP should not so one leak that large and next a leak that small. Loose gas cap will give you a large evap leak code condition which would be P0455 and a rupture evap hose would also give the same . what capable of giving a large leak and a small leak would be the EVAP system having its own internal leak. there is a Leak detection Pump a kink or disconnected vacuum supply hose will cause both these code condition Make sure all the vacuum hose are proerly connected and there no kink in the line.
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