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Fwiw, my step mom has had a cel p0442 in her 07' 3.5l on for the past 6 months and I finally decided to dig in today after some research on here. I ended up removing the Vent valve assembly by the filler and taking it apart (Easy). Cleaned out the canister and sprayed some lube inside the actual valve portion after reading about retiredpauly 's success. After about 10 minutes @ idle the light disappeared! It worked!! I'll give it some time but so far so good.

Just wanted the thank this forum once again. :)
 
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