upstream o2 sensor bank 1 is the one on top on the back bank or the one nearest the firewall. you will need to remove the coil pack and unbolt the wire harness out of way and use a 7/8 inch wrench and some pentrating lube and it
will come out i did the same one in an hour, easily.
good luck!!
1998 Contour V6 se ATX Black
Bassanni w/o resinators, modified intake box, DMD
New headlights w/ silverstar 9005's, blue neons inside, metal waterpump, pioneer head, pioneer 5x7
3 ways,2 10" subs, 800w amp, 17x7.5 motegi mr12 p215/45/17
| 
