I have a 2002 blazer and the o2 fuse keeps blowing as soon as the key is turned to the on position. I have searched on here and havent really found anything yet. I know it is a short but I couldent find the wiring diagram. So if anyone could help me out I would appreciate it. I have checked all the wires near the o2 sensors themselves and they all seem fine. I have gone through like 8 Mini 20 amp fuses killing me.

 

Although I have not heard of an O2 sensor shorting.....disconnect all the O2 sensors, turn to ON and make sure the fuse is good. Then if you have an ohm meter, check across the two black wires for a short. Should have 10 - 20 ohms or so. Or if you do not have an ohm meter, connect one O2 sensor at a time and see which one blows the fuse.

Let me know what you find out as I have an '02 as well.

Good luck.

 

I will have to try that tomorrow. I had to do three tens in a row so I havent messed with the truck sence saturday. I got the truck for a steal but everytime I go to work on it I find something else. Like saturday I was looking at the fuse box under the hood and it wasent even being held down by anything. Then I noticed the horn was mounted on the wrong side fixed that. Then Iam missing a pump on my windshield wiper resivor. But for a grand and only having 30,000 mile I dont mind getting dirty plus iam learning alot. Thanks agin for the help Iam loving this site.