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Re: failed emissions test
Hi hydrocarbons indicates it's running rich. Could be a bad O2 sensor, MAF sensor, the cat is shot, severely clogged air filter, old worn out sparkplugs (misfire). If she runs well, I would not suspect a valve timing issue or a misfire. Start by cleaning the MAF and replacing the O2 sensor. Replacing the cat would be next. Oh and make sure she's good and HOT before smog testing. Cats only work when they are HOT.
G/luck
Joel
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2016 Subaru Forester 2.5i base CVT
2016 Nissan Quest SV
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