I've had misfire codes for awhile (prolly too long honestly) I've replaced all gaskets I believe as well as a faulty brake booster. All plugs were changed cpl months ago and from what i remember half the coils (1,3,5). I've even had trouble with the inertia switch! Today I have these
301,303, 305, 1313, 1316, 1646.
I guess O2 sensor is next but reading on here I'm a little confused on which one? I'm just hoping I haven't messed up my CAT with my negligence. Thanks for any help guys

oh and it's 06 xtype with 103000

 

Sometimes the bad coils/etc have damaged a cat and then it messes with the back pressure causing misfire codes. There are ways to check cats (IR gun, borescope etc).

Or you might just have a wiring fault perhaps.

Sometimes just looking at fuel trims gives clues.