O2 Sensor Wiring
 

Hello Guys,
I have a Jimmy S-15 1989, I'm having problems with the O2 sensor, it's giving error code 13, I already replaced it twice and still getting the same error code. I am guessing it might be the wire.
could it be because of something else ? and guys is it easy to replace the sensor's wire - does it go directly to the ecu ?

How many wires are on that model year o2 sens. 3 ? It sounds dumb but on my 95-rip- I just had a bad ground that caused my light to come on.