i have a boost gauge installed an the p1591 code was thrown on. i did some research on some threads an it seems that were you T the boost line could cause a problem. i have my boost line T'd by the turbo inlet hose were the beige lookin thing is at. is this a bad an can cause a cel light? or is it electrical. any help is much appriciated.

 

You should install the "T" on one of the vacuum lines coming off of the by-pass valve. Look at subaruparts.com for install directions + pics.

 

thanks its already fixed