There is one before, and another after, the catalytic converter. Both are fairly cheap through many vendors on ebay. Replacing them is not hard if you have a lift and a nice long wrench. If you have neither take them to an exhaust shop and will cost less than $50 and take about a half hour. Keep away from Saturn dealer for this.
SOURCE: replace spark plug wires 1996 saturn sl series
engine side 1234/coil side 4123,all left to right.
SOURCE: 1994 saturn sl 2 oxygen sensor light came on
It could be the oxygen sensors but when you said there is a bad odor I would bet that you have a bad EGR valve. It will send a code for the oxygen sensor if there is problems with the EGR valve. A lot of the time the smell is like rotten eggs when you have a bad EGR.
SOURCE: Need to know how to check the oxygen sensors on a
Don't know if this will answer it. O2 sensors send info to the computer to make adjustments to the emissions system. Over time the O2 sensors fail which cause the computer to light the "Check engine" light. Originally the "Check engine" light was dedicated to an emission system fault. Now manufactures use it for a variety of abnormalities. To know what the "check engine" light means you have to either take it to a mechanic or buy a OBDII scanner (around $100) and read the code yourself. I like to read my own codes. These scanners are good for all modern cars. Instructions are included EZ to follow.
Long story short, don't worry about it the check engine light will come on when O2 sensor fails. Happy motoring!
Testimonial: "Thank you the info was helpful about the scanner."
SOURCE: 97 saturn sl needs heated oxygen sensor rear bank
It is very easy to change, just disconnect and unsrew old one and reinstall new one.
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