P0037 H02S heater control sensor issue

[Kanweezyyy]

Hello, I have a 2008 e92 m3. Mod wise it has test pipes and catless midpipe along with PROFLEX E85 kit.

It was running on E85 but was then flushed with 91 and parked for about a year. It was occasionally started here and there but not driven at all.

Today I went to start it as I plan to make it my daily driver now and it had the code P0037 and was misfiring like crazy, wouldn't even get up my driveway. It was for both bank 1 and bank 2. It would idle fine but once I try to give it some gas it started misfiring.

Any ideas what it could be? Didn't have too much luck searching on the forums.