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While the OP has left us, it's worth digging into the above statement.Apparently, its not that unusual. Are u reading the posts?
First, there are a few threads that address this matter with a lot of posts, but how many have actually experienced the problem relative the 100,000's of 2.5L NA's with cylinder deactivation sold since 2018? Forums are magnets for people with problems. The vast majority go blithely on their way of problem free driving without checking in.
In looking back at a old posts, mine and others, sometime in the last 10 months the Consumer Reports reliability rating for 2018 CX-5 "engine--major" has dropped from their highest rating to merely average. 2019 forward maintain the highest rating. Could it be that as this engine ages, as with the OP's 2018 with 40,000 miles, cracked cylinder heads start cropping up?
Perhaps. Typically, one problem with Consumer Reports' ratings is they blend all trims into one rating. We don't have that problem here since the turbo was not introduced in CX-5 until 2019.
So, how concerning should this drop to average be? You should be aware that in Consumer Reports data across all makes and models of 4 year old cars, the average reported "engine--major" issue constitutes "<1%." So going from 5-out-of 5 to 3-out-of-5 means going from some small fraction of 1% to a larger fraction of 1%. And some of these issues may be one-offs or two-offs engine failures unrelated to cracked cylinder heads that may have never made their appearance in forums. Some may be attributable to poor maintenance or abusive driving.
So how concerned should one be about having this problem in the future? Not much in the great scheme of things, though it bears watching over the coming years.
As for the issue being specific to cylinder deactivation, if one wants to go by forum posts I believe a cursory review of the CX-9 forum shows the turbo in those vehicles has more reported issues than here while having much lower sales volume.
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