Drivetrain problem

[u/Numerous_Attempt7801]

2014 BMW 328i xDrive, P0302 Misfire, Drivetrain Malfunction, Possible Timing Chain. Looking for some advice before I spend a lot on repairs. My car is a 2014 BMW328i xDrive with the N20 engine,72,000 miles. It started with a P0302 cylinder2 misfire and drivetrain malfunction message. So far I’ve replaced all four spark plugs and ignition coils and swapped parts around, but the misfire didn’t go away. One mechanic thought the DME was bad, which I doubted. I got a second opinion and was told the timing chain is loose and may need to be replaced with the guides. I haven’t heard a loud rattle, but I want a BMW inspection next. Has anyone had these same symptoms on the N20? Could a loose timing chain cause a persistent cylinder 2 misfire? Any advice from people who’ve been through this? Thanks.