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.

by in Kalamazoo, MI on April 22, 2013
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2 answers 1 comment
ANSWER by , April 22, 2013
Testing the evap system is the BEST way to get it right without wasting time and money on guesses.
COMMENT by , April 23, 2013
Is it just need to check the emission? Would it cost a lot?
ANSWER by , April 23, 2013
do the right thing and test properly or get it done to save time and money