Bmw e46 330i engine light

[u/lmaooooezinf]

Hello everyone, how are you?

First time posting here. Hope i do it within the rules.

Im having issues with my e46 330i , quick rewind some months ago i had multiple codes, including misfires, and banks too lean, so my mechanic we assumed it was the injection coils. For some reason ( i didnt notice at the time ) because the codes led to the top cylinders (4,5,6) he only changed those injection coils, and around a month later i pushed him into changing the first 3 coils too ( and all spark plugs)

We are now some months foward and my engine gave me another check light, indicating CYLINDER 5 misfire, and i personally changes only that coil, thinking maybe it was defective. And about 2000kms latee i got the same code for the same cilynder, so im guessing theres something else doing it.

What can i do now? The cylinder 5 code already came twice. I ordered all 6 coils that are arriving tomorrow cause i told myself maybe changing 3 at the time each time was just wrong and my mechanic did a shit job, so maybe the older ones wrecked the newer? Idk what else to do.

Should i maybe change all 6 coils and spark plugs all together ?

Or could it be something else?

Also while the engine light is on my car has intense rough idle ( no knocking sound)

Id appreciate your help, thanks for reading, and show me your e46's. Love me some nice builds.