Okay, so I need O2 sensors for my 1995 Mustang. I have a 6 cylinder and when I was looking sensor prices up online, it asked if the sensors were located before or after the catalytic converter. I have no idea which one mine is!

Does anyone know whether or not a 1995, 3.8 liter's oxygen sensors are before or after the catalytic converter or does it vary from car to car?

 

You have 4 sensors. 2 upstream, and 2 downstream.

 

So how do I know which ones to get for my car since I don't know which one is bad? Should I get all 4 changed at the same time and how much do O2 sensors usually run?

Thanks!

 

As a rule of thumb, I always recommend doing all at the same time. The only way to find a bad one is, if there is a trouble code, it will usually point to one, or to hook a reader to the OBDII port and observe each one to see which one is weak or bad.

EDIT~
Call the parts store for prices. I've seen them from like $59.00 up to $300.00. Depends on make and model of car, and the manufacturer of the sensor.

 

After the cat.. http://www.autozone.com/servlet/UiBr...TER&PageSync=8

before the cat... http://www.autozone.com/servlet/UiBr...TER&PageSync=8
Google is your friend.