I have a 2010 Forester X. I had a major, catastrophic engine failure at 245K. I totally rebuilt the engine including all new pistons, rings, one connecting rod, all new bearings, one new head, new catalytic converter... rebuilt everything. When I was done, the O2 codes were set. I tried to clear...

First post here. I know there’s many threads regarding o2 sensors and whatnot but I can’t seem to find exactly what I’m looking for. My CEL is on with code P0134 - O2 circuit no activity detected (bank 1, sensor 1) I know I need to replace the o2 sensor 1 (air/fuel sensor). I have the part and...

I have a 1999 Forrester. I am having issues getting it to pass inspection. From what I know the car has had an 2001 engine swap. The exhaust has two o2 sensors is this a 99 exhaust or 01?