I was in a car wreck and someone gave me this car (2002 V70 Non turbo 2.4 i think). So im walking into this a little blind. But its in limp mode has a p2177 code (also had a p0507 but that cleared) I have replaced Mass air sensor, o2 sensor, transmission speed sensor, and All the little vacuum lines. I am at a lose but need this car like yesterday for work so any help is greatly appreciated.

 

it may be the throttle body. Check out sites like xemodex or midwest ABS for some symptoms of a failing ETM (electronic throttle mechanism). They can be rebuilt for a lot less than replacing. Also, it could be PCV or air boot related. Did you consider having a smoke test done?