ok so my 1992 toyota started makeing noise the other day and i dont know whats wrong. i think that my o2 senser might be loose but im told that my engine is going though the noise is coming from under the passanger seat which is where the o2 senser is located. i am hoping that someone has had this problem before and could possibly tell me what you think. im hoping tht my idea is closer to being right versus the engine is going. thanks

 

Take seat out, have someone hang out in a secluded long straight, see if you can narrow it down.