Probably just an ignition coil. swap that coil with another and you should see the code move to that cylinder.
I had the #3 go out on my 2000 323 years ago. No others since? anyhow, I got the replacement at O'Reilly's Auto Parts. The part came in a BWD (Borq Warner box. Part number E-383 , I think) but on the coil itself it said Bosch?
BWD and Bosch must have merged or maybe BWD buys the coil from Bosch, and makes the rest, I dunno, but it worked.