Only just put mine back together, cracked piston in n.o 4 cylinder and a hairline crack starting in n.o 3. Changed all 4 so we’ll have to see what happens, aftermarket pistons just looked the same as the original ones but hopefully better quality...
Mines a rwd, the guy that tested/condemned my injectors reckons it’s usually pot 3 or 4 as they get the least cooling due to being at the back so not getting as much air flow and it’s the heat that does them.
All 4 of my injectors failed the insulation resistance test on the piezo so I put 4 new ones in as well.
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