So I thought I would be ridding myself of an O2 sensor code, ended up getting rid of my continuosly on Parking Brake light and not the code. I just resurected my 1989 S-10 by installing a rebuilt trans, the truck has been sitting for nearly 5 years. After fixing all the Pack Rat chewed wires I had, and a whole bunch of other issues that I had forgotten about in the last few years. I got the truck running and back on the road. I installed a new O2 sensor during all of the repairs. I got the code 13/SES light on first test run after about 5 miles of driving and pretty much what it does every time I drive it. Yesterday I broke out the VOM and checked continuity to ground, no ground. So I ran a wire from ground and attached it to the body of the O2 sensor via hose clamp since its only a 1 wire O2 sensor. I have continuity to ground now, thinking that would fix my code 13 in fact didn't but it made the Parking Brake go out. Any explanation for this would greatly appretiated.