I'm currently in the process of having my 2018's engine replaced under a CPO warranty and recently created a thread about it on this forum. Technically the blown head gasket issue affects not only the 2.0 but also the 1.5, 1.6, and 2.3 EcoBoost. There are several signs (usually a combination of two or more) to indicate the head gasket has been blown and the coolant is being burned:
1). Cylinder misfire(s) (generally cylinders 2 or 3 but can be any of them, and they usually trigger the Check Engine Light).
2). Coolant reservoir tank level decreasing
3). Thick white exhaust smoke
4). Liquidity, chocolate milk-looking oil
For me, my symptoms were cylinder 1 misfiring and my coolant level gradually decreasing over the last year. The disappearing coolant was the first symptom and after a while the misfire was the second which started less than 2 weeks ago.
An immediate way to know if your head gasket is badly blown is to remove the oil cap and look underneath it. If a substantial amount of coolant is mixing with the oil it will be really liquidy and resemble chocolate milk. In my situation the oil looked normal and I had no thick white exhaust smoke, just a misfire and losing coolant.
There are also tons of videos and resources on the internet that explain this issue more in-depth that are worth reading up on. 2017-2019 MKC's are affected by this issue because they utilize the 2nd-gen 2.0 where Ford redesigned the engine block to allow better cooling but, in the process, made it so there's less surface area for the head gasket to affix to, thus increasing the propensity for coolant to penetrate the gasket. Mileage at failure can range from as little as 30,000 miles (mine was at 37,000) to 100,000 miles from reports I've read.
2020+ model year Ford and Lincoln 2.0s are immune to the coolant intrusion issue because Ford redesigned the block again. Replacement engines use the updated block design.
Good luck.
