So my car is in limp mode. I have a feeling its due to the fact the battery cables were unplugged for 2 weeks while it was being worked on. I can't get out of it? No CEL, erased all DTC's with the Vag, and its still in limp. How do I get it out?

Also its idling real rough, at a steady 876 RPMs. Real sluggish when I start. I pulled Vag codes and they were a Voltage Low which I always seem to get? And Fuel Trim Bank 1- Lean / Fuel Trim Bank 2- Lean. Pulled running codes while idling and O2 sensor 1 is going crazy, running lean, then rich, then lean, then rich, then fine, then lean, etc. etc.. Sensor 2 is fine. Soooo....bad O2 sensor? Idk what 1 and 2 mean? pre-cat and post-cat?? Which is which?

plase help

*NOTE* Just installed new coils and plugs not even 3 weeks ago. MAF was just cleaned with MAF cleaner.