This is a guide for how to swap the electronic power steering motor on a TSS-P (2016-2020) Prius with one from a TSS2 Prius (2021-2022). This raises the torque limit, upgrades the steering position encoder, and provides more stable lateral control for the Comma. From my experience, the torque increases from ~45° to ~135°. This enables the Comma to take some right and left turns at intersections. Below is an example of the new torque around a corner running Sunnypilot with MADS enabled.
The two motor part numbers to get are: 89650-47600 or 89650-47800. 2021-2022 C-HR motors may also work, but are untested. Try searching on eBay or junkyards for used motors. Learning eBay search syntax such as (21, 22, 2021, 2022) Prius (EPS, power steering)
and saving searches with notifications helps. New parts are also an option, but may cost up to 8x more. Make sure there