Q: Hello Justin, I have an 07 Lacrosse 88K miles car has been perfect until recently, when it tripped a code for the upstream sensor

I have a 2007 lacrosse and it tripped a code for the upstream sensor one day. Thought no biggie just go grab one and replace it. I bought a Denso one, car was fine for a week or so then both sensors tripped. I ordered 2 new AC/Delco ones for it and it was okay for maybe a couple of days. Light came on again and I scanned the codes 4 were showing, both 02 sensors and low or no current to the sensors. Found a blown fuse. Replaced that and it may go a day maybe 2 and blows fuses still, some days it's several a day. I looked under the fuses where the wires come in to see if anything seemed amiss and nothing. I also checked to make sure the wires on the sensors had not come in contact with anything to get burned and nothing is even close to anything hot. As a little test I left for work one morning with the upstream one unplugged, after a couple of miles the fuse blew, I got to work plugged the upstream one back in reset the codes, changed the fuse and crawled under it and undid down

My car has 88000 miles.
My car has an automatic transmission.