I need to locate the Oxygen Sensor so that I can replace it myself

I need to locate the Oxygen Sensor so that I can replace it myself, my mechanic said that is why my check engine light went on and if I can save the money and replace myself?

Answer:

Nothing wrong with saving money that’s for sure. You have three o2 sensors . two are in front of the catalytic converter and one is behind the converter. You will need to find out which one. the 2 in front are called up stream sensors and the one behind it, yes you guessed it , is called down stream . the two in the front are up stream and referred to as bank 1 and bank 2 , bank 1 is on the side of the engine that has the Number 1 spark plug.  Now all you need to do is find out which one it is and replace it.