I have a 2015 Journey with the 3.6L V6 and about 78,000 miles on it. Earlier this month, I got a check engine light while idling stopped in traffic. I pulled the code, P0302 Cylinder #2 misfire, and cleared the codes. A couple days later, while idling in a parking space, CEL with same code popped up again. It went away on its own a couple days later. I thought maybe it was a bad tank of gas and moved on.
A couple fill-ups and about 1,000 miles later, the CEL came back with same P0302 code. Idle seems a bit rough but I notice any problems when moving.
I know the 2011-2012 Pentastars had a lot of problems with the left-side cylinder head causing cylinder misfires, to the point where leak testing the cylinders was the first diagnosis step. I understand later head designs after 2012-2013 were supposed to fix the problem but I've seen some sporadic postings of 2014 Pentastars with head issues.
Is the thinking even with the newer vehicles that misfires in the left bank are most likely a head problem? I'm trying to figure out if I should first try to replace the plugs/coil pack myself or should just take it into the dealer. I don't want to get into a big dealer bill if it's probably something I could have handled myself or had my local mechanic do.
Thanks for any guidance!