Car threw a P2096 code late in the day, Sunday. Code is "Too lean on bank 1 post catalyst" Reset the code and it didn't reappear in the last session. Got under car last night and one of the studs retaining the catalyst to the exhaust manifold is sheared on bank one (stud is still there but sheared) -- of course it is the most in-accessible one 
That explains the code, as it is allowing a leak under hard driving.......
That explains the code, as it is allowing a leak under hard driving.......
