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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

Vehicle: 1998 Jeep Grand Cherokee Laredo Limited V6

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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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P0455 JEEP - EVAP System Large Leak
Read more: https://www.autocodes.com/p0455_jeep.html

P0442 JEEP - Evaporative Emission Control Small Leak Detected
Read more: https://www.autocodes.com/p0442_jeep.html

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