My 3rz is from a 2000 tacoma with 2 cats. I got the exhaust ran and installed the 2 o2 sensors. 1 before the front cat and 1 after the rear. Is there a certain placement these o2 sensors need to be? The reason I am asking is my truck burned a valve and im wondering if that had something to do with it.
did you burn an exhaust valve? if so, when was the valve job done. seems to be common on these motors
