I got the engine light on and I got two codes p0455 and p0442 what can I do? on 2004 Jeep Grand Cherokee

It was happened might be 6 months ago but I didn't mention that until recently I bought a diagnostic test stuff and check it and found it is the emission or something problems, what can I do because I see the test method on the internet is extremely strict and annoying.

Asked by for the 2004 Jeep Grand Cherokee
do the right thing and test properly or get it done to save time and money
1 more answer , 1 more comment
Testing the evap system is the BEST way to get it right without wasting time and money on guesses.
Is it just need to check the emission? Would it cost a lot?